Workplace Investigations

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).

The principle of due care requires employers to act prudently when it comes to sharing the identity of persons involved, such as complainants and implicated persons; and investigative findings, notably when certain employees may be implicated. As a result, such information is usually shared within an employer to designated departments on a need-to-know basis only. Additional safeguards as to the protection of whistleblowers' identities apply since the Whistleblower Directive (see question 9) was implemented in Dutch law. Also, see question 13 for the confidentiality obligations of employees vis-à-vis their employer.

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.

If the investigation yields unrelated matters, the employer will need to decide whether such matters should be followed up in the same or a separate investigation. If such matters include new allegations against an employee that are already involved in the investigation, the employer should, before interviewing (or at the start of such an interview) inform the implicated employees of the relevant new allegations that are the subject of the investigation.