What Science Says About I-502's Faulty DUI Proposal
We've seen New Approach Washington's misleading FAQ sheets already, but thanks for using their arguments word for word. That makes it easier for us to wade through these deliberately-misleading statements.
Regarding BAC limits being "changed" over time, it's important to remember that limits have only been revised downward. Since the idea of a BAC limit was introduced, not one single lawmaker (on the local, state, or federal level) has argued for the BAC threshold to be raised. The same will be true with I-502's THC threshold. Once a 5 ng/limit is put into law, that number will only decrease, just like the BAC level has.
We'd also like to address New Approach's deliberate attempt to confuse people about THC and THC-COOH. NAW's FAQ sheet throws out a lot of scientific terms like "carboxy-THC," "inactive metabolites" and "THC-COOH." We're here to make it easy for you. ALL of these terms are fancy ways to refer to THC that is stored in our fat for anywhere between 30 and 90 days after last use. NAW says that this type of THC is *sometimes* used to convict marijuana users of DUI under current law. What they don't mention is their reason for using the qualifier of *sometimes* The reason inactive THC is only *sometimes* used to convict marijuana users of DUI is because the current law requires law enforcement to prove *impairment* That is one of the key difference between the current law and I-502's per se DUIC law. Under I-502, impairment is not the crime. The criminal act is having a blood level exceeding 5 ng/ml (over 21) or 0.00 (under 21) while also driving a vehicle. Therefore, whether you are impaired or stone-cold sober, if you exceed I-502's limits - you are guilty of a crime. Impairment no longer has to be proven in a court of law, like it does under the current statute for both alcohol and other drugs (prescribed and/or illicit).
Onto the science, which definitevely proves a 5 ng/ml limit will lead to INNOCENT PEOPLE BEING CONVICTED of a gross misdemeanor and possibly a Class C Felony. It's important to remember that if a 5 ng/ml limit will cause innocent people to be convicted, a 0.00 limit for under 21 will only increase that problem exponentially. We've footnoted all research and included links at the end of this post, so you can read it for yourself and make an educated decision about I-502.
New Approach WA cites two specific studies on its FAQ page about Driving Under The Influence of Cannabis or DUIC. One is a meta-analysis of 90 studies by Grotenherman et. al.(1) The other is a study by Karschner(2) of 25 frequent, long-term users. This is the only research New Approach has to "support" the nanogram limits proposed by I-502. We think it does little to support their claims and actually debunks those arguments.
· Grotenherman: Please see the Executive Summary. The first page discusses zero tolerance DUIC, as proposed in I-502 for drivers under 21. In the third-to-last paragraph, researchers state "This strict approach facilitates law enforcement but is not based on science and does not target impaired drivers." It goes on to say "the same applies to the increasing number of individuals who legally use cannabis for medicinal purposes and, while not acutely impaired, may present measurable THC concentrations at all times."
On page 16 of the report, in the section titled "Empirical Research on Cannabis and Driving," scientists conclude that "the evidence from epidemiological studies on cannabis and accident risk is still much less conclusive than for alcohol and alone is insufficient for adopting a science-based legal limit for THC in blood."
On page 31, under the heading "Summary and Discussion of Findings," the first sentence reads: "Scientific evidence on cannabis and driving is not yet sufficient to permit the selection of a numerical enforceable THC limit with the same level of confidence as for alcohol."
The study you've specifically alluded to is from Karschner:
25 frequent, long-term cannabis users resided at the U.S. National Institute on Drug Abuse. Participants were under continuous surveillance to prevent self-administration of cannabis. Their blood samples were frozen for 5 years. No Physical exams were performed to assess impairment when the samples were frozen or compared.
16 out of 25 participants (64%) tested positive for THC (not THC-COOH), but not necessarily on the first day. This indicates that THC levels are likely to rise as your body rids itself of stored cannabis. These levels are independent of last usage.
6 of the study participants (24%) displayed detectable THC concentrations (again, not THC-COOH), 6 full days after entering the unit. This is of great concern when considering a zero tolerance limit for drivers under age 21.
It is important to note that frequent, long term cannabis users are similar to medical cannabis patients, but they are not exact matches. The users in the Karschner study did not have a doctor’s recommendation to use cannabis. To date, no research has been done to accurately determine the impairment level of medical cannabis patients.
We also want to highlight a study from the U.S. Department of Transportation.(3) The National Highway Traffic Safety Administration was appointed by the Federal Government to study "Marijuana and Actual Driving Performance." One of the main objectives was "to determine whether it is possible to predict driving impairment by plasma concentrations of THC and/or its metabolite, THC-COOH, in single samples." The report says "the answer is very clear." Researchers found that "it is not possible to conclude anything about a driver's impairment on the basis of his/her plasma concentrations."
Perhaps most importantly, the above studies (along with expert testimony and other pertinent research) led the Colorado Legislature to scrap its plan to implement the very same DUI limit proposed in I-502. Because the science is considered murky by some, lawmakers appointed an 8-person committee to study the issue in depth. This working group was unable to come to a consensus and chose to recommend that no limit be set at this time.(4 5)
1*Grotenhermen, et al..Developing Science-Based Per Se Limits for Driving Under the Influence of Cannabis (DUIC) 2005*http://www.canorml.org/healthfacts/DUICreport.2005.pdf*
2*Karschner, et al. Do Delta-9 THC Concentrations Indicate Recent Use in Chronic Cannabis Users?*Addiction.*2009 Dec;104(12):2041-8*http://www.ncbi.nlm.nih.gov/pubmed/19804462*
3 US Department of Transportation 1993. http://www.druglibrary.org/schaffer/...g/dot78_1e.htm
*
4 DUID-Marijuana Working Group Recommendation. 2011. http://blogs.westword.com/latestword...ing_limits.php
*
5* Marijuana DUID Working Group Memorandum to Drug Policy Task Force
http://www.cannabistherapyinstitute....up.summary.pdf
Originally posted by The Seattleite
Regarding BAC limits being "changed" over time, it's important to remember that limits have only been revised downward. Since the idea of a BAC limit was introduced, not one single lawmaker (on the local, state, or federal level) has argued for the BAC threshold to be raised. The same will be true with I-502's THC threshold. Once a 5 ng/limit is put into law, that number will only decrease, just like the BAC level has.
We'd also like to address New Approach's deliberate attempt to confuse people about THC and THC-COOH. NAW's FAQ sheet throws out a lot of scientific terms like "carboxy-THC," "inactive metabolites" and "THC-COOH." We're here to make it easy for you. ALL of these terms are fancy ways to refer to THC that is stored in our fat for anywhere between 30 and 90 days after last use. NAW says that this type of THC is *sometimes* used to convict marijuana users of DUI under current law. What they don't mention is their reason for using the qualifier of *sometimes* The reason inactive THC is only *sometimes* used to convict marijuana users of DUI is because the current law requires law enforcement to prove *impairment* That is one of the key difference between the current law and I-502's per se DUIC law. Under I-502, impairment is not the crime. The criminal act is having a blood level exceeding 5 ng/ml (over 21) or 0.00 (under 21) while also driving a vehicle. Therefore, whether you are impaired or stone-cold sober, if you exceed I-502's limits - you are guilty of a crime. Impairment no longer has to be proven in a court of law, like it does under the current statute for both alcohol and other drugs (prescribed and/or illicit).
Onto the science, which definitevely proves a 5 ng/ml limit will lead to INNOCENT PEOPLE BEING CONVICTED of a gross misdemeanor and possibly a Class C Felony. It's important to remember that if a 5 ng/ml limit will cause innocent people to be convicted, a 0.00 limit for under 21 will only increase that problem exponentially. We've footnoted all research and included links at the end of this post, so you can read it for yourself and make an educated decision about I-502.
New Approach WA cites two specific studies on its FAQ page about Driving Under The Influence of Cannabis or DUIC. One is a meta-analysis of 90 studies by Grotenherman et. al.(1) The other is a study by Karschner(2) of 25 frequent, long-term users. This is the only research New Approach has to "support" the nanogram limits proposed by I-502. We think it does little to support their claims and actually debunks those arguments.
· Grotenherman: Please see the Executive Summary. The first page discusses zero tolerance DUIC, as proposed in I-502 for drivers under 21. In the third-to-last paragraph, researchers state "This strict approach facilitates law enforcement but is not based on science and does not target impaired drivers." It goes on to say "the same applies to the increasing number of individuals who legally use cannabis for medicinal purposes and, while not acutely impaired, may present measurable THC concentrations at all times."
On page 16 of the report, in the section titled "Empirical Research on Cannabis and Driving," scientists conclude that "the evidence from epidemiological studies on cannabis and accident risk is still much less conclusive than for alcohol and alone is insufficient for adopting a science-based legal limit for THC in blood."
On page 31, under the heading "Summary and Discussion of Findings," the first sentence reads: "Scientific evidence on cannabis and driving is not yet sufficient to permit the selection of a numerical enforceable THC limit with the same level of confidence as for alcohol."
The study you've specifically alluded to is from Karschner:
25 frequent, long-term cannabis users resided at the U.S. National Institute on Drug Abuse. Participants were under continuous surveillance to prevent self-administration of cannabis. Their blood samples were frozen for 5 years. No Physical exams were performed to assess impairment when the samples were frozen or compared.
16 out of 25 participants (64%) tested positive for THC (not THC-COOH), but not necessarily on the first day. This indicates that THC levels are likely to rise as your body rids itself of stored cannabis. These levels are independent of last usage.
6 of the study participants (24%) displayed detectable THC concentrations (again, not THC-COOH), 6 full days after entering the unit. This is of great concern when considering a zero tolerance limit for drivers under age 21.
It is important to note that frequent, long term cannabis users are similar to medical cannabis patients, but they are not exact matches. The users in the Karschner study did not have a doctor’s recommendation to use cannabis. To date, no research has been done to accurately determine the impairment level of medical cannabis patients.
We also want to highlight a study from the U.S. Department of Transportation.(3) The National Highway Traffic Safety Administration was appointed by the Federal Government to study "Marijuana and Actual Driving Performance." One of the main objectives was "to determine whether it is possible to predict driving impairment by plasma concentrations of THC and/or its metabolite, THC-COOH, in single samples." The report says "the answer is very clear." Researchers found that "it is not possible to conclude anything about a driver's impairment on the basis of his/her plasma concentrations."
Perhaps most importantly, the above studies (along with expert testimony and other pertinent research) led the Colorado Legislature to scrap its plan to implement the very same DUI limit proposed in I-502. Because the science is considered murky by some, lawmakers appointed an 8-person committee to study the issue in depth. This working group was unable to come to a consensus and chose to recommend that no limit be set at this time.(4 5)
1*Grotenhermen, et al..Developing Science-Based Per Se Limits for Driving Under the Influence of Cannabis (DUIC) 2005*http://www.canorml.org/healthfacts/DUICreport.2005.pdf*
2*Karschner, et al. Do Delta-9 THC Concentrations Indicate Recent Use in Chronic Cannabis Users?*Addiction.*2009 Dec;104(12):2041-8*http://www.ncbi.nlm.nih.gov/pubmed/19804462*
3 US Department of Transportation 1993. http://www.druglibrary.org/schaffer/...g/dot78_1e.htm
*
4 DUID-Marijuana Working Group Recommendation. 2011. http://blogs.westword.com/latestword...ing_limits.php
*
5* Marijuana DUID Working Group Memorandum to Drug Policy Task Force
http://www.cannabistherapyinstitute....up.summary.pdf
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