Automobile Accident?

Automobile Accident?
My Uncle had gotten into and automobile accident about a year ago...he was driving but was also drinking....the officer never tested him for alcohol in any way. The people whom he got into the accident with now want to take him to court stating he owes them money? Is there any way for them to prove he was drinking that night. Luckily nobody was hurt and it was all material damage...to the car and someones yard. I just wanted to know if he could still be charged with a DUI a year after?
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automobile accident attorney raleigh