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.