It is very sad when a student does something like that to their teachers. A similar thing happened to a teacher her in the Boston, but it wasn't an illegal substance. The student had put a laxative into the cake. With any so called prank it's best to not get caught.
When I went to school we had respect for our teachers.
we didn't have that kind of money to burn in HS. we were buying drugs for ourselves, not to secretly get the teachers high...
the laxative in the cake is a more traditional approach, i remember several of us doing that to another student. of course, it tends to be rather dangerous to medicate people unknowingly, but at the time we just thought it was funny...