The law doesn't specify voluntary or involuntary intoxication. Legalized drugs has given rise to DWI arrests for some who have passed a breathalyzer test. I saw a video from someone arrested then released after passing intoxication tests. The cop did the arrest because the driver appeared intoxicated. The first thing that came to my mind was that there could have been an exhaust leak causing carbon monoxide poisoning. If someone doesn't maintain their vehicle, resulting in carbon monoxide poisoning, is there grounds for being charged with Driving While Intoxicated? Is it worthwhile to keep an active carbon monoxide alarm in your glove box?