Off-duty Baltimore officer Gahiji Tshamba, the guy who seems to have emptied his glock at and into a man for touching his girlfriend seems to have a bit of a history. "Investigators found 13 bullet casings at the scene and the officer's gun was empty. Nine of those bullets ended up hitting the ex-Marine, which some say is excessive."
The problem is not drinking and carrying a gun in a bar. The problem is being drunk while having a gun, a temper, and really bad judgment!
Meanwhile another Baltimore officer is on trial for an on-duty shooting. This case is not so clear cut and knowing nothing, I'm not willing to comment. But he is the first officer to be put on trial for an on-duty shooting since the Lexington Market police-involved shooting of James "Don't Shoot that Boy!" Quarles (I saw that video in the police academy--one officer shot, many didn't).
[Update on the life and career of Officer Tshamba.]