Ayoob says on page 32 of "In the Gravest Extreme" not to impersonate a police officer. He advises for the citizen to yell out "Police, Hold it[or stop it]. The citizen is supposed to explain that he was yelling FOR the police during that sentence and not identifying themselves as an officer. The problem I have with Ayoob is that he tends to "major in the minors". I read one of his articles recently and he was talking about why you should carry a DA pistol, or DA/SA, load the same ammo as the police use, etc....
Basically, the point of doing all this was to prevent a jury from convicting you of a crime if you use a weapon in SD. He cited some case examples where that info came out in court, but in none of the cases was it the deciding factor. By focusing on such small details, he overlooks the "big picture", IMHO, such as carrying the gun that is best for *you*, use of deadly force requirements, etc....
I think he still has some good ideas, he just gets carried away sometimes.
Good points.
The problem I have with the book is it's out of date. At a time when the best ammunition you could buy was being used by the police, it may have been a good idea to copy them. When I first started using a handgun as a defensive tool, I bought Speer "Lawman" ammunition.
Today, I don't care what the police are using. I'm using a 1911 with Hydra-Shoks. My son uses a 1911 with Gold Dots.
Preparing to survive and during a shooting, the least of your problem is worrying about what a jury will do.