Forced to have med student… legal?

I work in a busy er always more than 2.5 and hour and recently had a day w 3.6 an hour. I was (without my knowledge) assigned a med student all week. I messaged the clerkship director and was told I am not allowed to send medical students home and that I have to have one. I am not compensated for them, am not in academics, and do not feel I can talk to them and do my shift work effectively. They're not going into EM and don't know any basic medical things (as fourth years) so require a lot of teaching (what's a stroke? What's TPA?). I actually love teaching and like to put time into it, but I'm just over my head w the clinical work.

Is it legal to give me students without my consent or an academic appointment or any money?

Edited to add: Ok they did know what a stroke is but not that there was a difference between ischemic and hemorrhagic, and not what an NIHSS was (just the concept, not the specifics) and couldn't remember what tpa was, and didn't know that there was a time frame to give it. They're 4th year outgoing family medicine. It's not in my contract to have students, I'm an attending, and again - I work elsewhere and love teaching! I just cannot do it here. I don't hate med students and I'm nice to them. I was one! I just did not sign up to teach them.