Im glad that you came to this board to learn! My best girlfriend's husband was a cop but now a detective. She is deaf and he is not. He took up ASL and Deaf Culture to gain understanding.
Learning Deaf Culture will really help you prepare more than just learning how to signs because some of us have different norms.
I have been pulled over a few times and I always get panicky because I am not sure what the police officer is saying - is he saying Dont move or is he saying Get out of the car or what? I am afraid to make a move in case he will misunderstand my actions. Do I open the door or roll down the windows?
Also a cop needs to understand that many of Deaf people do not have full understanding of laws so it is helpful to pull in a Deaf interpreter who can assist with breaking down what the sign language interpeter is saying. My girlfriend sometimes acts as a Deaf interpreter when her husband's department calls her to come in to help make that deaf person understand legal rights, etc.
