Brown Medical School, along with several other organizations, put together an online tutorial for emergency healthcare providers on human trafficking. I’m unsure when the tutorial was created (if someone knows, please pass that along), but it appears to be no older than 2005 based on the materials cited, so info is relatively current. Much of it is text-based, but it is well-linked in many places.
Because the tutorial was developed in Rhode Island, a few things are geared specifically to populations seen in this region. Overall, though, it seems applicable to a national (and in many places, international) audience.