If USAA is the other car's insurance then you cannot sue them; you would have to sue the driver of the other car in order to collect for the medical bills. If USAA is your auto insurance and you had medical payments coverage then you could sue your own insurance company under breach of contract.
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yes. a few weeks is more than adequate to review any matter. tell him to ask for his file and money back.
First time offender is generally not used for traffic tickets but you can plead Nolo Contendre to avoid points on your motor vehicle record. You still can contest the ticket even though you signed the ticket for the cop; that was just to show that you indeed received notice of the ticket.
you need to hire a workers compensation lawyer. your employer is liable under worker compensation law. you can deny the recording of your statement, but still answer insurance adjuster's questions. the store generally will not allow you to see the video.
you may be able to make a disability claim under the ADA act in order to keep your benefits. consult a disability lawyer.