James Fallows discusses his experience as a juror — "Build Your Vocabulary, 'Ass Baton' Edition", The Atlantic 5/2/2015:
Through the examination and cross-exams in this case, attorneys for both sides were careful to make sure that even very familiar terms were spelled out to remove the last bit of ambiguity. […]
There was one exception, the term I kept hearing as "ass baton." At one crucial point in this case, a white (as it happened, and young and ostentatiously fit) police officer was chasing a black (as it happened, and older and heavier) suspect down a dark alley, on foot. The policeman soon tackled the defendant from behind. What happened next?
"I struck him with the ass baton, and then I secured his hands with flexi-cuffs, and …" "And was the suspect injured by the ass baton?" "He did not appear to be, but since he would not say anything to us, as a routine precaution after use of the ass baton we called an ambulance…"
I learned afterwards that the other 11 members of the jury were all thinking roughly what I was: "Ass baton? Am I the only person who has never heard of this? I guess I can understand what it could mean, in context. You've got your hand cuffs, and your leg restraints. But really, an ass baton?" A jury isn't allowed to ask questions in court.