I am not sure where you are located however, in Canada there is a section in the Criminal Code (s.494) that allows any citizen to arrest without warrant, any person they FIND COMMITTING an indictable offence. For purposes of arrest a Hybrid or Duel offence is considered indictable. I believe the US has a similar citizen's arrest law.

Regardless of being a P.I. or not the investigator is still a citizen and this would apply to him or her.

Security and a citizen has the right to make a citizen arrest. But, if a mistake is done, both security and the citizen could be taken to court and sued - which could be very costly.

Police are subject to arrest just like any other citizen.

Jake and Amir - 2007 Citizen's Arrest was released on:

USA: 25 June 2013