Retrieving passport from the court after being found not guilty

Dear Sir,

My brother was involved in an incident at his company that claimed two lives (the victims died in a sewage tank).

During this process, my brother happened to be a safety officer in that company but the supervisor and the managers assigned those workers who died during the cleaning of the sewage tank without informing the safety department.

During the police investigation, my brother's passport was seized by the police and the case was referred to public prosecution.

After the final investigation, my brother (safety officer) was not guilty as the public prosecutor decided, but the supervisor was guilty since he gave the order to those workers to carry out the unsafe work without informing the safety department for proper risk assessment.

The supervisor was given a 5-month jail term. Concerning my brother, his case ended at the public prosecution office since he was not guilty, but since then, his passport is still held with the court.

Please, I need advice.

Thanks

Taka Farhad