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As another member pointed out, you might want to get the Alcohol test right before you try creating a marijuana test.
Be careful what you wish for.
Breath Alcohol Testing works on the assumption that all human beings are exactly the same, a falsehood in and of itself. It works on a concept that we all pass alcohol from our blood into our lungs at a given ratio of 2100:1, so the alcohol in your blood is 2100 times higher than the alcohol on your breath. It then measures a breath sample of 81ml and determines how much alcohol (acetone and dozens of other naturally occurring volatile chemicals chemicals) are in 210 Liters of breath. All told, multiplying the sample more than 5,000,000 times based on a hunch, then prosecutes a person for a crime based on a guess of what may or may not be in their blood, kind of Orwellian if you ask me.
There are "Drug Recognition Experts" and another member pointed out the Standardized Field Sobriety Tests - These are more government lies. Even if you believe the NHTSA (The fully owned regulatory arm of MADD, currently run by a MADD Chapter Leader) the SFST only determines with 80% certainty whether a person has a BAC of .10% or more. When the limit went down to .08%, they just said "Well, it works for that too" and one must ask oneself, how many innocent people were convicted of DWI while the limit was .10% based on a test which the NHTSA now admits discriminates all the way down to .04%
According to Mothers Against Drunk Driving, more than 1.46 Million people were arrested for DWI in 2006 alone. If just 1% of them were wrongly convicted, that is 14,600 innocent people who were arrested, had their licenses suspended, possibly charged with a felony, had their vehicles taken, their names released to the papers, put in danger of losing their jobs and all the other horrors that come along with such an ordeal.
What will happen when we implement a new test that doesn't work? Well, then the number will go up above 2 Million for sure.
Just prosecute bad driving, attempting to criminalize blood is dangerous.
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