Mich. Comp. Laws § Schedule § 2: Existing public and private rights, continuance.

Sec. 2.

All writs, actions, suits, proceedings, civil or criminal liabilities, prosecutions, judgments, sentences, orders, decrees, appeals, causes of action, contracts, claims, demands, titles and rights existing on the effective date of this constitution shall continue unaffected except as modified in accordance with the provisions of this constitution.