The National Highway Transportation Safety Administration (NHTSA) has a publication that lists the "symptoms" of drunk driving officers are trained to watch for in "driving pattern." Each "symptom" has been given a value NHTSA says represents the likelihood a driver exhibiting that driving pattern is under the influence of alcohol or drugs.

Here is the list from the Department of Transportation Publication (DOT HS-805-711) used to train law enforcement officers to identify intoxicated drivers:

Turning with wide radius     65
Straddling center or lane marker     65
Appearing to be drunk     60
Almost striking object or vehicle     60
Weaving     60
Driving on other than designated roadway     55
Swerving     55
Slow speed (more than 10mph below limit)     50
Stopping (without cause) in traffic lane     50
Drifting     50
Following too closely     45
Tires on center or land marker     45
Braking erratically     45
Driving into opposing or crossing traffic     45
Signalling inconsistent with driving actions     40
Stopping inappropriately (other than in lane)     35
Turning abruptly or illegally     35
Accelerating or decelerating rapidly     30
Headlights off     30


So here is how this works – if an officer sees you driving into opposing or crossing traffic, NHTSA educates officers that 45 times out of 100, the driver (you or me) is operating under the influence. It doesn’t matter the time of day, or the day of the week, NHTSA trains officers to believe that this stuff is "science.

In Boise, it seems like the most relied upon reason to stop a person for suspected DUI is driving after midnight. This is really the case if the driver is in the downtown corridor or near Boise State University. 
I watched a Boise cop make a wide turn the other morning on the way to work. It was around 6:15 am, but I gave him or her the benefit of the doubt. I never once thought "65 times out of 100 that officer is operating his cruiser under the influence of alcohol." According to NHTSA science, I should have.
Here’s the topper – NHTSA says that if you see two of the "symptoms" you take the higher of the two and add 10 points. So if that same officer was "drifting" as he made the wide turn, his likelihood of being a drunk driver would be 75 percent. 
More bull!
When I hear judges, prosecutors or cops talk about junk science, I want to direct them to NHTSA! 
So be careful out there. Not every law enforcement officer will suspect you are a drunk driver just because you "stop inappropriately" (whatever that is), but some of those with NHTSA training might.
A drunk driving conviction is a costly misadventure. Don’t drink and drive. 
If you have questions about a charge of driving under the influence in Idaho, give us a call. We can help you sort out the fact from fiction.