The only general answer I can give you is that the PI, and the entity that hired him, the the only ones who know what evidence has been collected by surveillance, and as a general principle, more evidence of something one is trying to prove is better than less evidence.
Not legal advice, just my two cents. I don't practice law in Georgia or hold licensure there. If you need legal advice, please consult a lawyer who does.
Just answering your two questions, as requested: Maybe, and maybe.
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Even if an insurance company had some surveillance evidence against you they would continue to pay a PI to continue to watch you. They will want to make sure that their case against you is air tight in case they ask for a hearing in order to suspend your benefits. I have also had clients who thought they were being watched when they, in fact, were not. You are allowed to live your life, just make sure that you are not doing things outside of your restrictions. Good luck.