first in-class arrest today

Today I subbed at a local high school for a music teacher. There was nothing left for my students to do, so they were just sitting around talking. I noticed one period that 3 of my 8 students in the class had disappeared. Five minutes later, a police officer and vice-principal walked in my class and took away one of my remaining students to arrest him. Apparently he showed my three disappearing students his bags of weed and vikadin. They quietly slipped out of class to tell the school administration. Who knew? I think I catch a lot as a teacher, but I guess I miss a lot, too. I had no idea this was going on until it all went down. Turns out the kid has gone through this many times before and has been through rehab, too. What a shame.