With the legalization of marijuana becoming a reality in some states, and other states strongly considering it, a problem arises. As with alcohol, driving under the influence of weed could present a problem, because whether you want to admit it or not - impaired judgement is impaired judgement.

Several different field tests have been in use for years to ascertain whether a subject has had too much to drink - the "backwards alphabet", "follow my finger", "walk the straight line" tests have been the law inforcement industry standards for as long as I can remember.

But what about pot? How do you know when a subject is over the legal (driving) limit? This video from the (206) will give you some idea: