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DUI Drugs Booking FormDUI Drugs CA: Easy to Charge, Hard to Prove

More arrests are being made for DUI drugs than ever before.  While it’s always been illegal to drive while under the influence of drugs, the legalization of marijuana, ready availability of other illicit drugs and proliferation of prescription medications has increased the number of arrests and prosecutions of people for driving while their ability to drive is impaired by drugs.

The way a DUI Drugs arrest usually happens is that a cop observes something that he feels is indicative of being under the influence.  He then pulls the person over, runs them through the field sobriety tests (see here for an explanation why the FSEs are bunk). He then does a preliminary alcohol screening test and it comes up negative or below the legal limit for alcohol. The cop then calls in a different cop with training in a different level/kind of voodoo called a Drug Recognition Evaluater (DRE).

That cop then runs through a 12 step protocol (irony alert) to determine if the person’s ability to drive is impaired by drugs. One of the things they are taught to look for is a green tongue as evidence that the person has smoked marijuana.  This is ludicrous.

As part of the DUI Drugs screening, the cop asks the person to identify all the drugs they take, legal and illegal.  Most people want to cooperate with cops (this is always a mistake — remember: unless you are a lost six year old, that cop is NOT there to help you!) because they think that will get them on their way.  The person admits to using some drug, often thinking that if they admit to the drug they are legally taking, they will be released.

At the end of the DUI Drugs evaluation, the evaluation cop makes a guess about what drug the person is under the influence of (mostly based on what the person tells them) and sends their blood out to be tested. The case is prosecuted as a DUI Drugs case.  The blood test comes back and shows the person has a drug in their system or doesn’t.

These DUI Drug cases are insidious because they are so easy to charge.  The drug the person has in their system doesn’t have to be illegal and since a majority of people use prescription drugs to manage some problem and all these drugs have some side effect, the cop can easily make an arrest. The cops take two mostly unrelated events: admission to drug use and failure on their Drug DUI evaluation to correlate that the person’s supposed impairment (based on the cop’s observation of ‘poor’ driving) is caused by drugs.

The problem is that science tells us that you can’t determine whether a person is impaired by drugs by the fact that they have a certain drug in their system.  First, drugs remain in the blood a long time after they have any effect on one’s ability to drive.  So presence in the blood doesn’t mean the drug is still acting on the body.

Second, and most importantly, everyone who uses a drug — prescription or other — develops a tolerance to the drug.  That tolerance is unique to the individual and can’t be predicted.  The person who uses a drug over a period of times adapts to it’s presence in the body. So use of a drug, doesn’t predict that the person was impaired by the drug.

This means that DUI Drugs prosecutions are difficult if not impossible to convict.  The State’s lab tech has to admit that he can’t tell by the presence of a drug that the person was impaired by the drug. The prosecutor then has to rely on the obviously biased testimony of the DRE cop to say that the person’s behavior was due to being under the influence of whatever drug the blood test showed.  This can be a different drug than the one they guessed during their evaluation.  The problem with this scientifically and logically is that it’s confusing correlation (the presence of two variables) with causation (one variable [drugs in the body] caused the other [subjective failure of the DRE]).  There is also the problem present in all DUI prosecutions that failure on subjectively evaluated tests means impaired ability to drive.

See my article about DUI and marijuana here.

See my article about the DUI Drug Test in CA here.

If you have any questions about DUI Drugs, impairment by drugs, or other DUI or drug related topics, call me at (213) 479-5322. If you have an opinion, leave a comment.

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