Re: Cops in the area of Camp Crystal Lake
The full body armor explanation only works until you see the security footage from the police station. Kevlar can stop small caliber rounds, but I don't think anybody would keep to that theory after seeing Ahnuld being pelted by assault rifles. And I think a few officers even shot him in the face; rationalize that, I challenge you!
"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
--Arthur C. Clarke