Workplace Investigations

Mainly, the Occupational Safety and Health Act (738/2002). In addition, the following also have relevance in connection to a workplace investigation: the Employment Contracts Act (55/2001), the Criminal Code (39/1889), the Act on Occupational Safety and Health Enforcement and Cooperation on Occupational Safety and Health at Workplaces (44/2006), the Act on Equality between Women and Men (609/1986) and the Non-discrimination Act (1325/2014). In addition, the employer's own policies must be taken into consideration while conducting a workplace investigation.

The Labour Protection Act B.E. 2541 (1998) (LPA) is the key legislation governing the relationship between employer and employee in Thailand. The LPA set out a minimum standard for the protection of employees’ rights, as well as a mechanism for suspension from work for an investigation.

The LPA requires any employer having ten or more employees to prepare work rules in the Thai language and the work rules require an employer to prescribe a procedure for the submission of grievances that would normally include the process for investigations in the workplace. Therefore, the work rules are the main guidance and policy that govern a workplace investigation. In some cases, an employer may have a whistleblowing policy allowing whistle-blowers to submit complaints of illegal or improper activities to the employer. The whistleblowing policy will also prescribe the procedures for investigating in workplace reflecting the complaints submitted by whistle-blowers.

When the employer becomes aware of possible misconduct, the employer must commence an investigation immediately, in practice within about two weeks. The information may come to the employer's knowledge via, for example, the employer's own observations, from the complainant or their colleagues or an employee representative.

Usually, a complainant submitting a grievance to the company would be a trigger for proceeding with a workplace investigation. The LPA does not specify when a workplace investigation should commence but it is subject to the employer’s work rules and regulations, including the whistleblowing policy, as the investigation usually commences after an employee or a whistle-blower has filed a complaint to the employer. In some cases, there might be a whistleblower and the start of the workplace investigation would be subject to the whistleblowing policy and the employer’s discretion. Also, if a questionable transaction or activity is detected, fiscal audits may be the source that triggers a voluntary workplace investigation.

There is no legislation on temporary suspension in the event of a workplace investigation or similar. In some situations, the employer may relieve the employee from their working obligation with pay for a short period.

While an employee is being investigated by the employer, the LPA permits the employer to suspend that employee from work for the duration of the investigation, provided that the suspension can only be made when permitted by the work rules or an agreement related to the conditions of employment. Also, a suspension order must be made in writing and specify the offence and period of the suspension, which may not exceed seven days. Note that the employer must give a written suspension order in advance to the employee before the work suspension.

As aforementioned, the LPA only permits the employer to suspend the employee under investigation from work only for seven days. During the interim period of the suspension, the employer must pay the employee at the rate indicated in the work rules or the agreement reached between the employer and the employee, which must not be less than half of the employee's wages for a working day before his or her suspension. If the employer determines that the employee subject to investigation is not guilty following the outcome, the employer must compensate the employee for outstanding wages from the date of suspension with 15% interest per annum.

In some complicated cases, a workplace investigation does not conclude within seven days, and, in which case the employer should consult with a legal advisor.

The employer must conduct the investigation, but the actual work can be done either by the employer's personnel or by an external investigator, for example, a law firm. Either way, there are no formal criteria for the persons executing the investigation; however, impartiality is required from the person conducting the investigation

The employer should conduct a workplace investigation on its own; however, an outside firm experienced in interviewing witnesses and assessing the credibility of evidence may also be appointed to assist with the workplace investigation.

There is no minimum qualification or criteria provided under Thai laws. It is worth noting that anyone who has been accused of misconduct or potentially has a conflict of interest should be excluded from any role in the investigation. This is to avoid a challenge from the subject employee that the investigation was not conducted fairly.

The employee does not have a legal right to stop the investigation. The employer must fulfil its obligation to investigate the alleged misconduct.

There is no mechanism in place to take legal action to halt an investigation. The investigation is an internal process of the employer.

There is no legislation on a witness's role in investigations. However, the legislation on occupational safety requires that employees must report any irregularities they observe. Depending on the situation, participating in the investigation may also be part of the person's work duties, role or position, in which case the employer may require the employee to contribute to clarifying the situation. However, there is no formal obligation to act as a witness, and there is no legislation regarding the protection of witnesses. If a witness wishes, they may have, for example, an employee representative as a support person during the hearing. 

Normally, the work rules prescribe requirements for cooperation with investigations. An employer may instruct co-workers to give statements as witnesses as this would be a fair and legitimate order of the employer, because investigations are conducted to maintain a good working environment.

Witness protection measures in a workplace can vary as no minimum standard has been set and they are generally subject to work rules and regulations. However, some legislation, which may not relate to a workplace investigation conducted by an employer, also protects the witnesses who are helping authorities investigate violations under the relevant acts. For example, the Labor Relation Act B.E. 2518 (1975) prohibits an employer from terminating an employee or conducting any action that may result in the employee being unable to work because of filing a complaint or being a witness for the authorities, or providing information on issues related to labour protection laws to the authorities.

The employer may have a policy of non-retaliation for the protection of witnesses who have given statements and evidence for a workplace investigation.

Generally, the basic principles set out by the GDPR and the Finnish Data Protection Act apply to data processing in connection with investigations, including evidence gathering: there must be a legal basis for processing, personal data may only be processed and stored when and for as long as necessary considering the purposes of processing, etc.

Additionally, if physical evidence concerns the electronic communications (such as emails and online chats) of an employee, gathering evidence is subject to certain restrictions based on Finnish ePrivacy and employee privacy laws. As a general rule, an employee’s electronic communications accounts, including those provided by the employer for work purposes, may not be accessed and electronic communications may not be searched or reviewed by the employer. In practice, the employer may access such electronic correspondence only in limited situations stipulated in the Act on Protection of Privacy in Working Life (759/2004), or by obtaining case-specific consent from the employee, which is typically not possible in internal investigations, particularly concerning the employee suspected of wrongdoing.

However, monitoring data flow strictly between the employee and the employer's information systems (eg, the employee saving data to USB sticks, using printers) is allowed under Finnish legislation, provided that employee emails, chats, etc, are not accessed and monitored. If documentation is unrelated to electronic communications, it also may be reviewed by the employer. Laptops, paper archives and other similar company documentation considered "physical evidence" may be investigated while gathering evidence on the condition that any private documentation, communications, pictures or other content of an employee are not accessed.

The basic premise is that all evidence is admissible unless it violates the law of admissibility and production of evidence, which may vary depending on the jurisdiction. In a criminal court, for example, evidence gathered in violation of the fruit of the poisonous tree doctrine would be typically inadmissible, yet in a civil court, this doctrine would not be an exclusionary rule.

The Personal Data Protection Act, BE 2562 (2019) (PDPA), which is the main data protection law in Thailand, applies when collecting, using, and disclosing pieces of evidence containing the personal data of employees. If the investigation requires sensitive information of the employee under investigation, for example, race, ethnic origin, political opinion, religious or philosophical beliefs, sexual behavior, criminal records, health data, disability, genetic data and biometric data, consent from the employee should be obtained.

Only the police can search employees' possessions (assuming that the prerequisites outlined in the legislation are met).

Electronic information created during employment would generally be owned by the employer and would be the employer’s assets. If an employee is given a computer or laptop to use for work, the employer has the right to log into that device and take any data that is stored therein, provided that the data does not contain sensitive information of that employee and PDPA requirements are met.

To avoid any potential issues regarding physical data such as documents on the employee’s desk, it is advisable to search those areas with the subject employee to show good faith. In practice, the employee normally agrees to search those areas with the employer, or allows the employer to search alone.

In respect of data protection, the processing of personal data in whistleblowing systems is considered by the Finnish Data Protection Ombudsman (DPO) as requiring a data protection impact assessment (DPIA).

It is down to the employer’s discretion and subject to the whistleblowing policy (if any) to commence the investigation resulting from a complaint from a whistleblower. Whistleblowers and those who cooperate with an investigation should be protected. Normally the employer would not try to identify the whistleblowers. Also, it is best not to reveal the identity of the witness or the source of information; otherwise, they may feel uncomfortable giving information or raising their concerns next time. Any allegations of retaliation that surface during the investigation should be treated as a new report of possible misconduct that could be subject to additional investigation.

Concerning a workplace investigation, there is no specific legislation in force at the moment regarding confidentiality obligations. All normal legal confidentiality obligations (eg, obligations outlined in the Trade Secrets Act (595/2018)), and if using an external investigator, the confidentiality obligations outlined in the agreement between the employer and the external investigator, apply. Attorneys-at-law always have strict confidentiality obligations as per the Advocates Act (496/1958).

Unless the investigation is handled by a qualified professional (eg, attorney or auditor) where certain privileges apply, confidentiality obligations are generally subject to the contractual arrangement between the parties involved in the investigation. The employers need to inform any persons, including the investigators, to respect confidentiality obligations because a leak of the information gathered from the investigations could cause damage to relevant parties.

The process must be transparent and impartial, and therefore all the information that may influence the conclusions made during the investigation should be shared with the employee.

The subject employee(s) should be informed of the details of the allegations, such as the details of wrongdoing or violations, made against them. This creates a fair opportunity for them to clarify themselves and defend against such allegations properly. Also, if there is any evidence that needs clarification from the employee, it should be shown to the employee.

See question 11, there is no protection of anonymity as the process must be transparent to the parties involved.

It is generally possible to keep the identity of the complainant, witnesses, or information sources confidential. There is no mandatory rule to disclose the identity of a complainant, witnesses, or sources of information. If the complainant, witnesses, or sources of information for the investigation know that their identities would not be disclosed, they will be more confident in cooperating with and supporting the investigations.

Yes, however, the need for an NDA is assessed always on a case-by-case basis.

Non-disclosure agreements can be made between an employer and employees who are involved in an investigation. This may include investigators and witnesses, apart from the employee under investigation. This minimises the risk of information being leaked, which can affect all parties related to the workplace investigation. However, an NDA is not absolute means to prevent the disclosure of confidential information, as the court has the authority to compel disclosure.

The privilege of investigation materials concerns a rather limited amount of cases. In practice, materials may be considered privileged in connection with the litigation process under the Procedural Code (4/1734). For example, communications between a client and an attorney may attract protection against forcible public disclosure.

Client-attorney privilege between qualified attorneys and the client (ie, an employer) begins once information is made available to the attorney, regardless of the form it takes.

The employee under investigation has a right to have a support person present (eg, a lawyer or an employee representative) during the hearings and a right to assistance in preparing written statements.

Unless the work regulations provide otherwise, an employee has the right to request legal representation during an investigation. If legal representation is requested, it is an opportunity for the employer to confirm and verify that an investigation is being conducted fairly, as the employee under investigation can bring his or her lawyer to attend the investigation.

A works council or a trade union does not have a role in the investigation.

Thai labor laws do not require a workplace investigation to involve participation from trade unions or labour unions. However, it is possible for labour unions established under the Labor Relation Act BE. 2518 (1975) to submit a demand for a collective bargaining agreement (CBA) with employers to get a seat at the table. There was a case where a management union made a CBA with the employer wherein the president of the management union would be involved in any investigation of any manager, who is a union member, under investigation. In that case, the employer must comply with the CBA by informing the president and allowing the president to participate in the investigations.

They can request assistance, for example, from an occupational health and safety representative, a shop steward or the occupational healthcare provider.

The employees may then file a complaint with the labour inspection officer of the Labour Protection and Welfare Department to investigate the situation if they view that the conduct of the employer in the investigation violates the LPA. For example, if the employer issues a written order for suspending an employee for more than seven days. The labour inspection officer may issue an order requesting compliance, where failure to comply with such an order would result in a criminal penalty.

If they are related to the work or workplace, the employer will handle the emerging matters separately. In internal investigations, the employer is allowed to use any material legally available.

Subject to the grievance protocol in place, any matter that emerges during the investigation should be handled separately as a fresh report of potential misconduct that needs further investigation.

If the nature of the grievance relates to the employer's obligations to handle such matters in general, the grievance will be investigated either separately or as a part of the ongoing investigation.

The investigator should guide the employee who has raised the grievance to properly raise their concerns through the grievance protocols or whistleblowing policy (if any). It is acceptable to preliminarily hear their concerns, but the investigation should be initiated separately and subject to the employer’s discretion.

As a general rule, sick leave does not prevent an investigation from progressing. Depending on the nature of the sickness, the employee can attend hearings and take part in the procedure. If the sickness prevents the employee from participating, the employer can put the process on hold temporarily.

If the absence is anticipated to be brief, the employer may wait until the employee's return before concluding the investigation. If the employee's absence is expected to be prolonged, the investigator may alter the time of meetings or request that the employee submits a witness statement. The key point would be that all necessary measures should be taken to give the employee a chance to participate.

Regardless of a possible criminal investigation, the employer must run its internal workplace investigation without unnecessary delay. A workplace investigation and a criminal investigation are two separate processes and can be ongoing simultaneously, so the criminal process does not require the workplace investigation to be stayed. Thus, parallel investigations are to be considered as two separate matters. The police may only obtain evidence or material from the company or employer if strict requirements for equipment searches are met after a request for investigation has been submitted to the police.

Employers are not required to wait until the police or regulatory investigations are finished before conducting their disciplinary investigations, but it is necessary to ensure that such internal proceedings do not compromise the integrity of an investigation or result in misrepresentation or a miscarriage of justice. The level of proof for internal disciplinary action is less than the level of proof for criminal proceedings.

The employer's conclusions from the investigation.

There is no mandatory information on the outcome of an investigation that must be disclosed to an employee. However, disclosure of the outcome should, at a minimum, include whether an employee did or did not commit a violation. In addition, an employee who has committed a violation should be informed of any disciplinary action, and the grounds for such a decision (such as a violation of the company’s work rules). This enables the employee under investigation to appeal the outcome if it is applicable under the work rules or whistleblowing policy.

The employee under investigation may only be informed of the conclusions.

It depends on with whom the investigation report should be shared. If there is a court case or criminal case to be further investigated by police, the investigation report should be shared in full as this would be used as documentary evidence to make a case stronger. On the contrary, if the investigation report is requested by the employee under investigation, employers are entitled to use their discretion as to what information to share.

The employer decides whether misconduct has taken place or not. Depending on the case, the employer may recommend a workplace conciliation in which the parties try to find a solution that can be accepted by both sides. The employer may choose to give an oral reprimand or a written warning. If the legal conditions are met, the employer may also terminate the employment agreement.

Upon completion of the investigation, the employer can decide to take proper disciplinary action against the employee if it is found that the employee committed an offence or violated the work rules. An employer may also file a report with the police if the findings of the investigation amount to a criminal offence.

In general, investigation materials, including findings, that includes personal data should only be processed by the personnel of the organisation who are responsible for internal investigations. However, it may in some situations be required by applicable legislation that findings are disclosed to competent authorities for the performance of their duties, such as conducting investigations in connection with malpractice and violations of the law.

The investigation findings should be disclosed to a limited group of persons who are involved in the investigation, and for which the findings are useful. For example, an HR manager who needs to record the findings in the employee’s record, the police if the employer decides to proceed further with a criminal claim, the court if requested by that court, or if there is a court case related to the violations of the employee.

Interview records should be kept confidential and private. There is a risk of disclosure because the information in the records may be beneficial to one but damaging to others. If the interview records are leaked to others who are not involved in the investigation, it may affect the work environment in the workplace and the protection of witnesses.

Please see question 7. The outcome of the investigation involving personal data may be retained only for as long as is necessary considering the purposes of the processing. In general, the retention of investigation-related data may be necessary while the investigation is still ongoing and even then the requirements of data minimization and accuracy should be considered. The data concerning the outcome of an investigation should be registered to the employee's record merely to the extent necessary in light of the employment relationship or potential disciplinary measures. In this respect, the applicable retention time depends on labour law-related rights and limitations, considering eg, the applicable periods for filing a suit.

There is no period required by law for keeping the outcome of the investigation on the employee’s record. However, if termination of employment is the outcome of the investigation, an employer should keep details of the investigation for at least 10 years, in line with the prescribed period for an employee to file an unfair dismissal claim against an employer. An employer may use the details of an investigation to defend such a claim. For other disciplinary action, the retention of investigation details on the employee’s record is at the employer’s discretion.

There are no regulations regarding the actual investigation process. Therefore, the employer cannot be accused of procedural errors as such. However, once the matter has been adequately investigated, the employer must decide whether or not misconduct has taken place. If the employer considers that misconduct has taken place, the employer must take adequate measures for remedying the situation. Failure to adequately conduct the investigation could result in criminal sanctions being imposed on the employer as an organisation or the employer’s representative, or damages.

The Thai Supreme Court has ruled that the termination of an employee was unfair due to an investigation being conducted contrary to requirements in the company’s work rules. As such, employers may be liable for damages to employees if there are errors made during investigations, or where investigations are not conducted properly.

The Supreme Court has also ruled that in cases of unfair termination, the underlying cause of the termination should be the determining factor, rather than other issues, including investigative procedures.