Mich. Comp. Laws § 380.622 : THE REVISED SCHOOL CODE — Act 451 - Revised School Code — GENERAL PROVISIONS — INTERMEDIATE SCHOOL DISTRICTS — Financial institutions for deposit of school funds; selection; coded accounts; audit; separation of funds; investments; commingling prohibited; exception; earnings; accounting for money combined for investment pool; limitation on deposit or investment of additional funds; limitation on acceptable assets; secured deposits; form of security; "deposit" and "financial institution" defined