

I mean, try to steer him to not be “one of the bad ones” and always do the right thing even if that means the possibility of getting fired.
If he starts abusing his power, thats when you have to cut off the friendship.
Basically, act as his conscience, and stop him from getting corrupted by the system.
Remember, if its not him, someone else is taking his position. Just use the fact that this happened to be your friend to try to act as a moral guide. But be willing to confront him if he becomes corrupt and be prepared of the possibility to lose this friend.
Bruh which police department, I wanna make a mental note of that in case I ever go traveling.