Officer Safety Act of 2012 - Amends the federal judicial code to deem a law enforcement officer who is the defendant in a criminal prosecution to have been acting under the color of his office (thus authorizing removal of the case to U.S. district court) if the officer: (1) protected an individual in the officer's presence from a crime of violence; (2) provided immediate assistance to an individual who suffered, or who was threatened with, bodily harm; or (3) prevented the escape of any individual whom the officer reasonably believed to have committed, or was about to commit, in the officer's presence, a crime of violence that resulted in, or that was likely to result in, death or serious bodily injury.