Mr. Leroi has offered some great insights. Let me ad some.
DUI and DUID are traffic offenses that relate to some foreign substance in someone's body making them substantially incapable of operating of operating a motor vehicle safely. Cough medicine or vodka -- it makes no difference.
If you were cited, I presume a police report exists. Hire a criminal defense attorney in Weld County to fight this case if you feel wronged. I cannot comment on the other concerns you raised, but I...
Of course you need a personal injury attorney. Such attorneys work on contingent fee arrangements, meaning they take a set percentage of the damages they collect for you. 33% is quite common.
Shop your case around and see if you can find counsel that will take less!
So sorry to hear of this collision.
When you reported this to to your carrier, they had the right to conduct an independent investigation -- just as with the adverse carrier. You are stuck in a situation where unless you had the right coverage (collision or comprehensive, perhaps), you may be stuck making repairs to your own car due to the fact the other carrier has denied payment to you.
You can always sue the other driver, but a factfinder (judge or jury) will necessarity make a fault...