Mich. Comp. Laws § 224.31: Verification of transactions; immunity of bank, contractor, or other person providing information.

Sec. 31.

For purpose of verifying transactions disclosed by an audit or investigation, a person or firm authorized to conduct an audit under this act may ascertain the deposits, payments, withdrawals, and balances on deposit in a bank account or with a contractor or with any other person having dealings with the county road commission.

A bank, contractor, or person shall not be held liable for making available any of the information required under this act.