There is a thing called permissive use where the owner of the car is essentially extending their coverage to the person driving in the act of giving them the car to use. Another issue that may crop up here is a clause eliminating coverage if the vehicle is being used during the commission of a crime. Lots to unpack in this scenario. The downside here besides any injuries/soreness, the loss of the vehicle and trying to replace it, is the policy is likely a minimum limits policy, so coordinating coverage with your own carrier(Uninsured/underinsured).