illegal to film police brutality?

im watching the news and several states including pa. its illegal to film police officers even when police are abusing theyre rights and breaking the law themselves. you can be charged with illegal wiretapping, a felony charge.this is bullshit and i will always record any act of police brutality..its the only weapon we got to stop police abuse of powerits not 1 im willing to give up without a fight.the police have cameras at traffic lights just in case we run a red light do they have to get a wiretap warrant for that?its not like u got a camera hidden in theyre bathroom catching private moments we are talking about public displays of brutalitythey do not deserve to be protected from theyre own actionswithout being able to film them there will never be proof of theyre actions and they will get away with abuse of power in almost every case..