In order to assist a prosecutor in criminal investigation, the law manifestly specifies the following offices as the facilitating bodies so as to ensure effective exercise of the prosecutorial function.

1. Judicial police officer:
• Those who has the duty to assist a prosecutor in investigation a crime are: 
• county magistrate or mayor. 
• the head of a police department, commissioner of police or commissioner of public safety.
• military police officer
• Those who shall follow the instructions of a prosecutor in investigating a crime are:  
• Commissioned police officers. 
• Military police officers or non-commissioned officers.
• Persons who are authorized to exercise the duties of a judicial police officer in specific matters.
2. Judicial policemen:
• Those who shall follow the order of a prosecutor in investigating a crime are:
• policemen 
• military policemen 
• persons who are authorized to exercise the duties of judicial policemen in specific matters.