Multiple parties can potentially be held liable for a drunk driving crash. That is in part because Colorado has laws in place that, under certain circumstances, hold alcohol vendors and social hosts responsible for injuries caused by the intoxicated party they provided alcohol to.
According to Colorado Revised Statutes section 12-47-801, an alcohol vendor can be held liable if they sold alcohol to someone who was under 21 or visibly intoxicated. A social host could be liable if they knowingly served alcohol to a minor under 21 or knowingly provided them a place to consume alcohol.
Given these laws, potential parties who could be held liable in addition to the drunk driver may include, for example:
Bars
Restaurants
Liquor stores and other vendors
Parents or other adults who host parties for minors with alcohol
College fraternities