According to a letter sent to parents, the teacher at Webster Elementary in Collinsville suspected one of his students had soiled themselves in class.
In an effort to find out who it was, he had each student remove their underwear in a private bathroom stall while he waited outside.
"I'd be infuriated if they did that to my son or my daughter," said one resident.
The school district called the teacher's actions inappropriate and said he would not be back in the classroom.