Michigan Compiled Laws, Chapter 423. Labor Disputes and Employment Relations § 423.509

Sec. 9. (1) If an employer has reasonable cause to believe that an employee is engaged in criminal activity that might result in loss or damage to the employer's property or disruption of the employer's business operation, and the employer is engaged in an investigation, then the employer may keep a separate file of information relating to the investigation. Upon completion of the investigation or after 2 years, whichever comes first, the employee must be notified that an investigation was or is being conducted of the suspected criminal activity described in this section. Upon completion of the investigation, if disciplinary action is not taken, the investigative file and all copies of the material in it must be destroyed.

(2) An employer that is a criminal justice agency and that is involved in the investigation of an alleged criminal activity or the violation of an agency rule by an employee shall maintain a separate confidential file of information relating to the investigation. Upon completion of the investigation, if disciplinary action is not taken, the employee must be notified that an investigation was conducted. If the investigation reveals that the allegations are unfounded or unsubstantiated or if disciplinary action is not taken, the separate file must contain a notation of the final disposition of the investigation and information in the file must not be used in any future consideration for promotion, transfer, additional compensation, or disciplinary action.The employer may release information in the separate file to a prospective employing law enforcement agency if the information is part of a record regarding the reason or reasons for, and circumstances surrounding, a separation of service under section 5 of the law enforcement officer separation of service record act, 2017 PA 128, MCL 28.565. The employer shall release information in the separate file to the Michigan commission on law enforcement standards upon the request of the Michigan commission on law enforcement standards.