About the last reply, I'm in CA, too. But WA has been a "no-fault" state if I recall correctly, so the lawsuit for a medical claim is unlikely. As long as you have proof the claim was settled as the other party's fault, then this incident alone should not affect the cost to you.
As far as adding another driver, insurance companies traditionally rate the "highest-rated-driver to the highest-rated-car". That means it depends on how many drivers, their records/age/status etc., cars, specifics for each, etc. before it makes any cost difference for your roommate driver.
The company is asking for their usual opportunity to calculate what they consider how much risk they potentially have (based on how their rates are filed). If they find there is someone who potentially has access to your vehicle, they want to make sure that person meets certain basic criteria (licensed, record, etc.).
Having a young driver is usually much more expensive than a more mature driver. And driving record is important, too. Only one car, two potential drivers (no other insurance), then the highest rated driver's rates apply; if they are the same, then there isn't an additional premium.
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