Michigan's new no fault auto insurance law caused more than 1,500 traumatically injured people to lose some or all of their medical care.
It also caused more than 3,000 job losses and the permanent closure of 21 companies that cared for survivors.
That's according to a study by the Michigan Public Health Institute.
The study only looked at the first few months of the law's impacts, but more research is planned.
Advocates say the law will continue to leave more injured people without necessary medical care, until it's fixed by the state legislature.