How can private investigators do what they do?

They are NOT cops, right?

How can they just go around and “spy” and do surveillance on someone without a warrant?

How can this be legal to do?

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MistyCee

They can't legally do what would require a warrant, like trespassing or wiretapping.

Most PI reports are about them sitting and waiting for the subject to leave the house. It's pretty rare when they catch someone hauling lumber or even changing a tire.

Honestly, these days a background and social media check is far more useful/dangerous than surveillance, and it's a hell of a lot cheaper.