De facto is a pretty common term. Sorry you had to look it up.

It's pretty obvious how the immunity was granted: Overzealous prosecutor looking for a high profile conviction doesn't read the agreement he's slapped together because he's salivating so hard and, consequently, doesn't notice that he forgot to specify that Jaded refrain from engaging in the conduct in question (or any other criminal conduct, which is usually a component of such deals.) jaded's Lawyer, however, quickly sees that there's a loophole Jim could drive a Mack truck through, and advises his client accordingly. Q.E.D.

How was the game tonight?