Non documented person?

A non documented person with no official ID was involved in a car accident. Fender bender but it was her fault. What laws are there that allowed this person to avoid trouble due to lack of ID's?
Update: The below did not happen and the accident was 8 months ago.
Update 2: All we know is his family of 4 are still here and no negative results from the accident and he had no driver's license and no other form of ID at the time of the accident.
Update 3: They were an insured driver but had no license.
Update 4: They paid a fine of around $250.
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