As for the murder for hire claims, correct me if I'm wrong but that wasn't proven as directly related to Ross.
They didn't even try to prove it. However, if they did we all know what the end result would be. It is quite clear he was deep in this murder for hire thing. That the DEA was a shithead didn't lesson the fact that Ross was all-in when it came to killing that guy.
Oh, it was clear, no prosecution needed.
Please jump from a bridge.