The Obama Administration's Department of Justice, Community Relations Service, has produced this twelve minute video aimed at the law enforcement community, to help them in their interactions with the transgender community.
An excellent video, aimed directly at cops, informs them on what they might encounter when contacting the transgender community, and explains the terms they need to understand. While the video focuses on M to F transgender, the basics of how to interact apply to all members of the transgender community, as well as anyone who is LGB.
Good job, DOJ! And thank you!