No idea but they don't.
No issues when trying to enter or leave the country (American tourist visiting)?
I have a $200 ticket in collections (I was the primary renter but the additional driver got a parking ticket and didn't want to pay).
I'd (obviously) rather not pay since I don't feel responsible for his ticket.. However if there's an actual risk of getting stopped at the airport, I'd rather call the collections firm and make sure they close the file (pay etc.).