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There is a Legacy version here.

PFS StandardSuspect of Opportunity [reaction] Feat 10

Investigator 
Source Player Core 2 pg. 110
Prerequisites Person of Interest
Trigger A creature who isn’t, to your knowledge, tied to any of your active investigations takes a hostile action against you in combat.

Sometimes something intrudes upon your case unexpectedly, such as an ambush sent to bring your investigation to a close. You use Person of Interest against the triggering creature. This doesn't allow you to use Person of Interest more frequently than normal.