Mich. Comp. Laws § 38.83b

Sec. 3b. (1) Before July 1, 2024, and except as otherwise provided in subsection (2), a teacher is not considered to have successfully completed the probationary period unless the teacher has been rated as effective or highly effective on the teacher's 3 most recent year-end performance evaluations under section 1249 of the revised school code, 1976 PA 451, MCL 380.1249, and has completed at least 5 full school years of employment in a probationary period. (2) Before July 1, 2024, if a teacher has been rated as highly effective on 3 consecutive year-end performance evaluations under section 1249 of the revised school code, 1976 PA 451, MCL 380.1249, and has completed at least 4 full school years of employment in a probationary period, the teacher is considered to have successfully completed the probationary period. (3) Beginning July 1, 2024, if a teacher has been rated as effective on or after July 1, 2024, or effective or highly effective before July 1, 2024, on 3 of the teacher's year-end performance evaluations, including the most recent year-end performance evaluation, under section 1249 of the revised school code, 1976 PA 451, MCL 380.1249, and has completed at least 4 full school years of employment in a probationary period, the teacher is considered to have successfully completed the probationary period.