Good cop - bad cop

Is Cassidy innocent or is not it?
The film is all done pretty good in everything. It takes a while until you behind the intentions of the protagonist comes. And all the trials and tribulations of the police comes to a head towards the end. The output of the film is not terribly surprising, but you can follow the action tense. I think it's a little excessive, like all react to this suicide attempt and felt at once the whole city upside down.
However, I find the reaction of the people very well presented - I say only "Sensation horniness". Frightening and aptly!

!! WARNING SPOILER !!

I find it extremely cool, this conspiracy of all cops - as in The Departed. Especially because there is only after some time behind. And the true intentions of the Fed becomes clear only in the last scene!