Came across this short note in Indian Talk, a 1973 newsletter by and about Michigan Indians and a precursor to the original Turtle Talk, referencing a federal lawsuit filed to have Michigan public law 750.160 declared unconstitutional. That law prohibited Dr. Frankenstein and others from digging up graves, but granted an exception to Indiana Jones in case he found some Indian bones:

Shay Elbaum at the Michigan law library found a 1974 law repealing the part about “aboriginal inhabitants.”

Can’t find a record of the lawsuit, however. It probably went away when the state legislature repealed the exception.