Observational studies do indicate higher THC levels in drivers is dangerous, but not enough research has been conducted to recommend a cut-off corresponding to BAC levels of 0. No validity studies or evaluation studies were found on blood tests cut-offs and performance. In other words, we have yet to determine what level of THC in whole blood makes someone as impaired as they would be if their BAC was 0.
What little evidence we have suggests the proposed thresholds for blood THC concentrations are extremely low. And even if we knew what the proper levels were, we lack ways of drawing and accurately measuring THC blood in a timely manner. Part 1: Proposed federal legislation on cannabis and alcohol impaired driving.
Part 2: The safety benefits of alcohol breath-testing: a research summary. Part 4: The myth and origins of hour performance deficits from cannabis. He has been an expert witness in several cases related to drug testing in the workplace.
Skip to content In my last post , I briefly reviewed the research evidence of performance deficits from the acute effects of alcohol. What biological specimens are valid? At what rate is THC eliminated from the body? What is the relationship between THC and human performance? Conclusion and comparison to breathalyzer tests Overall, major differences exist when comparing the scientific benefits of alcohol testing versus cannabis testing. Read our Cannabis and Driving blog series: Part 1: Proposed federal legislation on cannabis and alcohol impaired driving Part 2: The safety benefits of alcohol breath-testing: a research summary Part 4: The myth and origins of hour performance deficits from cannabis Scott Macdonald is the Assistant Director of research at the Canadian Institute for Substance Use Research and a professor in the School of Health Information Science at the University of Victoria.
This means that females may metabolize marijuana slightly more slowly. Dehydration increases concentrations of THC in the body. While drinking lots of water is unlikely to affect a drug test significantly, severe dehydration might. Exercise will not significantly change the rate at which the body metabolizes THC. Exercising before a drug test, however, might. A small study of 14 regular marijuana users assesses the effects of 35 minutes of exercise on a stationary bike. The results conclude that THC concentrations increased by a statistically significant amount, suggesting that exercise right before a drug test may increase the likelihood of a positive test result.
The researchers believe that exercise may cause fat cells to release THC. For a drug test to be negative, the body must eliminate THC from the system, as well as metabolic chemicals that have links to THC. People with faster metabolisms typically eliminate THC more quickly than those with slower metabolisms. Ultimately, there are only two strategies that work for this, and they are decreasing the concentration of THC in the marijuana and speeding up the metabolism. Proper hydration can prevent a drug test from showing unusually high THC concentrations.
For people whose test results are on the border of positive and negative, this means that being dehydrated may increase the chances of a positive result. There is no reliable way to speed up the metabolism. Exercise might help the body metabolize more THC, but exercising too near to a test may also cause a positive result.
There is no way to accurately predict the amount of time it will take an individual to metabolize marijuana and eliminate it from their bodies. Home tests can help people test themselves for the presence of marijuana in their system. For almost all people, marijuana should disappear or be very low in concentration within 30 days. For infrequent users, it may take 10 days or less for marijuana to leave the body.
Weed detection windows depend on how much you smoke or ingest, as well as how often. In general, higher doses and more frequent use are associated with longer detection times. For daily users, cannabis may be detectable for several months after last use. The longest-reported detection times are more than 90 days.
Drug tests measure weed and its by-products, or metabolites. According to Mayo Clinic Proceedings , weed is detectable in urine for the following amounts of time after last use:. Cannabis metabolites are fat-soluble, which means they bind to fat molecules in your body. As a result, it can take some time for them to leave your system. Urine testing is the most common testing method. According to an article in Therapeutic Drug Monitoring , weed is typically detectable in the blood for 1 to 2 days.
Chronic heavy use increases the length of time that it can be detected. Weed is detectable in the bloodstream within seconds of inhalation. Some of it is reabsorbed in the blood and broken down. Its metabolites may remain in the bloodstream for days. According to a review on cannabinoids in oral fluid, weed is detectable in saliva for the following amounts of time after last use:.
Weed can enter the saliva through smoking and exposure to smoke. However, its metabolites are only present in saliva when weed has been smoked or ingested. Hair follicle tests assess drug use for up to 90 days. After use, weed reaches the hair follicles via small blood vessels. Weed, on the other hand, lasts far longer.
Tetrahydrocannabinol, or THC, can be detected in urine, blood, and hair for several days after usage, although saliva tests can only identify THC for a few hours. This is due to the way THC is metabolized in the body. THC is a lipid-soluble molecule that has been verified. This implies it binds to fat in the body, increasing lean mass. Check out this HelloMD article on the topic.
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