You should arrest someone that is drinking and driving.
Bob is a police officer, and he just stopped his childhood friend for driving while drunk.
Bob wants to take care of his friend.
Bob arrests his friend after testing to see how drunk he is.
Bob lets his friend go since he doesn't want an arrest on his record.
Bob's friend is upset, but he ends up getting help for his alcohol problem.
Bob's friend is putting his and other lives at risk by drinking and driving.