Michigan Compiled Laws, Chapter 38. Civil Service and Retirement § 38.81

Sec. 1. (1) Subject to subsections (2) and (3) and section 3b of this article,  1 a teacher is in a probationary period during his or her first 5 full school years of employment.

(2) Subject to section 3b of this article, a teacher under contract but not on continuing tenure as of the effective date of the 2011 amendatory act that amended this subsection is in a probationary period during his or her first 4 full school years of employment.

(3) A teacher on continuing tenure as of the effective date of the 2011 amendatory act that amended this subsection continues to be on continuing tenure even if the teacher has not served for at least 5 full school years of employment.