Especially when Internal Affairs begins to take notice...
Yeah, but then the Blue Line gets drawn quite quickly.

Also, if he's doing Shadowruns
FOR Lone Star using some form of deniability (Fake SIN with alternate biometrics, maybe?), there's some 'Runs set up right then and there.
Another option... Said 'Runner
IS IA, going on Shadowruns to ferret out dirty cops and departments that are doing things that would embarrass the company (And, you know, maybe doing something illegal as well.). Another possibility, Undercover work, like the character in the old "Lone Wolf" novel.