Teacher Issues: WHO CAN LEGALLY TEACH HIGH SCHOOL CI CLASS WHEN TEACHER ON INDEFINITE LEAVE? Posted on 09/12/2017 by Community — 1 Comment ↓ Karla: Our daughters teacher is on an indefinite leave. Currently, teacher interim is a certified elementary Ed teacher and ” in the process of entering the special Ed program” at a university. Is this legal? We are in Michigan. Thank you.