Under Arizona's Zero Tolerance Law a medical marijuana patient whom is pulled over is going to have obviously marijuana in their system even if they are not impaired or under the influence at the time if tested.
Couldn't a lawyer request a toxicology expert to testify to the fact in front of a jury that even though a toxicology report came back lets say with 2 ng/ml active THC in the blood and metabolites that the fact of the matter is that 2 ng/ml of active THC and metabolites can indeed be in a medical marijuana patients blood even a few days after ingesting their medicine and the case be thrown out?
Giving a medical marijuana patient a duid/dui simply on a blood report showing marijuana in their system would be like giving a DUI to a drunk who drank on Friday a DUI on Monday.
Here is a case that was won in California http://tokesignals.com/college-student-beats-marijuana-dui-charge-in-california/
DUI / DWI Attorney
In my opinion, the answer to your question is yes. You can have an expert testify that a medical marijuana user may test positive several days after ingesting marijuana. An expert can also testify that a driver is likely not impaired at 2ng active THC. There are many scientific studies that support such testimony and the state's expert may also be aware of these facts. This could result in the jury finding the defendant not guilty. However, as I understand AZ law, even the presence of the metabolite can be used as evidence of impairment (even though it is not). If you are charged with DUID in AZ you should immediately contact a skilled DUID attorney who understands the science behind marijuana metabolism in order to build an effective defense. If you want more information on this, I recently published a chapter on this subject in "Utilizing Forensic Evidence in Criminal Cases" 2014 ed. You can find the book on Amazon.
Car / Auto Accident Lawyer
This should be posted to a criminal defense attorney in AZ
Medical Malpractice Attorney
This probably belongs on the criminal law/ DUI side of AVVO. But that said, there are clearly contradictions and issues to be worked out for medical marijuana users. It the legislature doesn't clean this up (and they likely won't) the courts will have to attempt to reconcile the obvious discrepancies.
Personal Injury Lawyer
Not malpractice, repost in correct section
Criminal Defense Attorney
I have addressed these concerns in a recent article to be published in the next issue of Attorney at Law magazine distributed in Arizona/Maricopa County. I have summarized the article in a legal guide on AVVO. I hope it addresses your concerns.
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Criminal Defense Attorney
Unfortunately, as the law stands now, having a card is "not" a defense to either an A1 or A3 charge. Cases are making their way up on appeal and the matter will eventually be resolved in the appellate courts or by the Legislature.