Keep iPad from remembering my AppleTV Airplay password

We have multiple AppleTV's in our school and I wanted to minimize the possibility of a teacher interupting another teacher mirroring their iPad, so we setup passwords for AirPlay to an AppleTV.

However, after successfully entering the password and mirroring to the AppleTV, if I return to that AppleTV my iPad remembers the password for AirPlay and will connect without asking for my password again, thus putting us right back in the situation we had before.

My question is, is there are way to keep my iPad from remembering my password? Is there a different way I should be tackling this problem?

Thanks