just seriously, stop fooling yourself. If the man is clean he's going to come clean. If he's dirty then his underwear will be washed by Bubba in the prison. It's really just that simple.
Why do you make it so hard? There's no other explanation. You do understand that there are thousands of FBI agents roaming the planet right?
Nobody gives a shit about that criminal except for you and your buddies. Lets get on with our fucking lives and stop being idiots for a change.