not drunk people riding with drunk people

300 BLOCK EAST 21st STREET
Driving While Intoxicated / Public Intoxication: A silver Chevy truck was observed disregarding several stop signs. The right front tire of the vehicle was flat and the driver was driving the vehicle on its rim. When the vehicle finally stopped, the officer detected a very strong odor of alcohol and vomit inside the truck. The officer asked the driver to exit the truck. During a conversation with the driver, the officer detected a strong odor of alcohol on the driver’s breath. The officer asked the driver if he was aware that he was driving on a flat tire. The driver informed the officer, through slurred words, that he did not know that the tire was flat and wanted to know which one. During the investigation the driver attempted to conduct several Standardized Field Sobriety tests. After several failed attempts the driver was taken into custody for Driving While Intoxicated and transported to Central Booking. An additional officer arrived and interviewed the two passengers inside the vehicle. The officer observed that the back seat passenger was sitting in a pool of liquids that was being absorbed into the seat and was wiping partially digested food stuffs off of his lap. The officer observed that the subject was sweating profusely and was disorientated and confused. Aside from the aroma of vomit the officer detected a strong odor of alcohol inside the vehicle. During the investigation, the officer determined the back seat passenger was a danger to himself and took him into custody for Public Intoxication. The subject was transported to Central Booking. Officers interviewed the front seat passenger and determined that he had also been consuming alcohol but was not intoxicated and was of legal age. He was allowed to walk to his dormitory room. Occurred on: 9-01-06, at 1:00 AM.

Notice that Officers interviewed the front seat passenger and determined that he had also been consuming alcohol but was not intoxicated and was of legal age. So, why didn’t he drive? I don’t understand.
The driver was obviously really drunk, as was the backseat passenger. Did the quasi-sober person just sit back thinking nothing was amiss?
::shakes head::