"The presence of alcohol in the blood interferes with the normal use of oxygen by the tissues (histotoxic hypoxia). Because of reduced pressure at high altitudes and the reduced ability of the hemoglobin to absorb oxygen, the effect of alcohol in the blood, during flight at high altitudes, is much more pronounced than at sea level. The effects of one drink are magnified 2 to 3 times over the effects the same drink would have at sea level."
Now, I think they're referring to the effects at about 10,000 feet worth of altitude which is what I believe airline cabins are pressurized at while flying. Denver is about half that at 5,280 feet, so the effects won't be quite as pronounced, but still an issue. There sure are some partying skiers come to Colorado with the express purpose of taking advantage of this effect, which they usually find to have great disadvantages the next morning!
Just a little something i found, although ill continue looking for what you're actually looking for aint the easiest to find lol :-/.