Listen to what he is saying, especially in the back of the patrol car. he clearly is unstable likely due to drugs and mental illness, it is pretty obvious.
That is why 911 was called, his story and the way he was acting didn't make sense and people know when something isn't normal.
Violate his constitutional right? Afraid not.
And i am not hung up on race, but that is the reason this is such a "big story" right now, if he was white, you never would've heard about this story, because it's not that big of a deal either way.
and again BS, I would be the first to criticize these officers if they did something wrong (like the officer cursing at him out of frustration definitely should be written up for that), but the response to resistance was appropriate for the circumstances, especially if he really did grab an officer's weapon.