Fortunately, here in MA, we recently had a case where, two police officers (one of whom's girfriend used to work for me), went into a home, under the ASSUMPTION that it was being broken into, without announcing themselves. Now, a little background on this.
The person's home in question is an affluent member of society. He was supposed to be away on vacation. His neighbor, late one night, noticed the lights on in the bedroom. Being vigilant, he called the cops. Well, the cops responding, apparently went into "hero" mode, and did everything they could possible do wrong. The guy's car was in the driveway. Clue one. Upon entry, they neither announced their presence, nor answered when someone (the homeowner), called out. The homeowner, assuming burglars, dailed 911, then grabbed a pistol. Still, the police failed to announce their presence. They proceeded up to the now locked bedroom, and kicked in the door. First guy through caught a bullet in the chest. Fortunately, he had a vest on. The homeowner realized they were police, dropped the weapon, and was arrested for attempted murder.
Well, they guy got off, for several reasons. First, the police did not follow protocol, nor did 911 inform either the homeowner, or the police responding, about the call from the homeowner while the cops were in the house. The police, by failing to announce themselves, created a danger for all involved, that could have been avoided. The homeowner was found innocent of any & all charges, due to the fact that he had assumed, as any rational person would, that someone kicking in his door was set to do him harm. So, as soon as he saw a silouhette, he shot at it. Upon realizing his mistake, he immediately surrendered his weapon. The court, thankfully, found him well within his rights to defend himself, due to the fact that he had unknown intruders in his home, called out & received no answer, locked his door & called 911, then, when someone kicked in his door, he feared for his life. The only thing those two officers did correctly were put on their vests (thankfully), and tell the truth (unbeleivably). I am unsure as to what the outcome was for the two officers. I know the one who was shot was fine, he walked away with bruised ribs only. As far as their duty status, I dont know.