Just look at the front of the yellow rental jacket BIG WARNING IN RED

"Dont lose your rental priveleges allowing unauthorized drivers may result in loss all insurance coverages"

We had a customer that would rent every week from us, we would always present her the rental jacket, "These are your terms and condition of the rental" She would get smart and say everytime oh i already know them my heart. Apparently she didn't, she let her 18 year old niece drive a brand new car down the car and her niece hit another driver and totaled the brand new hertz car. Come to find out both insurances denied coverages for both parties(renter and niece). She probably had to file for bankruptcy, not many people have 20k just laying around these days