Michigan State legislature has been formulating a statewide Board for Massage Therapy since February 13, 2001.
www.michiganlegislature.org/
There is mention of 500 hours and a national examination to be passed. The AMBA has compiled all the state legislature information on Massage Therapy.
http://www.abmp.com/members/legislative/MI.html
Check with local county and city Business and Professional Licensure departments for laws and regulations in your area.