Ironically, Percy later became the Commander of the Internal Affairs (IA) Division, the very unit responsible for catching corrupt officers.
: Hutchinson tells Jackson that Percy planted a murder weapon on him years ago when there was no evidence to secure a conviction.
: Percy continues to lead Internal Affairs and even appears in Season 6 to investigate Tim Bradford, maintaining his role as a stern disciplinarian despite his own admitted history of breaking rules for "the greater good".
In Season 3, Percy is shown as a hard-nosed disciplinarian who is "livid" when Nolan and Harper don't involve IA in their investigation of Armstrong. Conclusion: The Unanswered Question
So, is Jackson West’s dad a dirty cop?