Ok..I work in the counselor's office. Tomorrow you go straight to the coun. office and see YOUR counselor..you tell them what you heard him say..it will remain anonymous...also there is an 800 number you can call..1-800-HOTLINE...it should lead you to the one for you area and you can report it anonymously as well..but I would talk to your counselor and let them handle it. If your school is so small that you don't have one, then call the hotline. He can really hurt someone..slipping a child something...they can have a reaction...and die...especially if they are small...

And tell your parents...if he does something and a child is hurt/dies..you are going to be loaded down with guilt and you don't want that ( it won't be your fault, but I know that is what you will go thru)