Many times in cases where a driver is suspected of driving under the influence of alcohol, one of the central questions is why the person was pulled over in the first place. Police will often claim that they had noticed a very minor infraction, such as failing to come to a complete stop at a stop sign, or a small violation of the speed limit. It may not be until after they have pulled the driver over and engaged in a prolonged discussion that they decide to investigate the driver for potential drunk driving.
While the initial reason for some stops that lead to drunk driving charges may be harder to pin down, in other cases the reason for the stop is fairly apparent. This week, a Colorado man was charged with driving under the influence after other drivers contacted the police reporting that a truck was pulling a small trailer that had become unhitched. The trailer was apparently being pulled along on its side only by the safety chains.
The driver had pulled off the road assumedly to reattach the trailer to his pickup truck when law enforcement officials encountered him. The 52-year-old man faces charges of drunk driving and reckless driving, though the news reports on the story have not given any indication of what police claim his blood alcohol concentration to have been at the time.
Even when, as apparently in this case, the police have a valid reason to engage the driver, there may still be questions regarding the testing methods used to attempt to ascertain a driver's blood alcohol concentration. The devices used by law enforcement to do this must be carefully maintained and calibrated. In addition to be used properly the officers must receive comprehensive and regular training in administering these tests.
Source: KKTV News "Driver Who Dragged Trailer Up I-25 Charged With Drunk Driving," Dec. 14, 2011