Cherry picking of de complete data set?
Lekkere stroman weer.
Dat is dus niet wat ik zeg.
Ik geef aan dat er wel degelijk een correlatie is tussen cannabis gebruik en rijvaardigheid.
Bij welke methodiek van meten van waarden in het bloed, en wat daarvan de gevonden gemiddelde invloeden zijn voor de rijvaardigheid staan dus in die science papers waarvan jij beweert dat je ze allemaal hebt gelezen.
Je hoeft maar te googlen op ‘correlation thc blood levels and driving impairment’ en je vind genoeg conclusies. Nu zeg ik niet dat er één wetenschap is, gelukkig maar, maar de studies die mijn beweringen ondersteunen bestaan wel degelijk.
THC in blood and saliva are poor measures of cannabis impairment - The University of Sydney
For infrequent, or occasional cannabis users, some significant correlations between blood and oral fluid THC concentrations and impairment were observed. However, the researchers note that most of these relationships were “weak” in strength.
No significant relationship between blood THC concentration and driving performance was observed for ‘regular’ (weekly or more often) cannabis users.
“Of course, this does not suggest there is no relationship between THC intoxication and driving impairment,” Dr McCartney said. “It is showing us that using THC concentration in blood and saliva are inconsistent markers for such intoxication.”
Driving Under the Influence of Cannabis: Impact of Combining Toxicology Testing with Field Sobriety Tests - PMC (nih.gov)
Our results are consistent with a recent meta-analysis that concentrations of THC are “relatively poor indicators of cannabis-induced impairment” (
29). Unlike ethanol (
30,
31), there is no established relationship between blood THC concentrations and simulator driving performance measures (
4,
26). In the largest randomized double-blinded placebo-controlled trial to date, our data confirm that THC concentrations (and/or metabolites/related cannabinoids) in blood, OF, or breath cannot be used as a sole indicator of impairment.
In the largest trial to date involving experienced users smoking cannabis, there was no correlation between THC (and related metabolites/cannabinoids) in blood, OF, or breath and driving performance. Our data support the current practice in many areas of the United States that requires officer observations of impairment along with toxicology testing before prosecuting drivers for being under the influence.
After two hours, blood THC was relatively low at about 2.8 ng/mL. Blood THC was significantly increased after consuming the cannabis edible, but the mean increases in blood THC were lower than those reported for smoked cannabis. Researchers also found no direct relationship between blood THC and driving impairment, speculating that “the present study suggests that blood THC may not be as useful for detection of impaired driving after edibles as it may be for the smoked route.”
Study: THC Blood Levels Not Correlated With Changes In Driving Performance - NORML
Study:
THC Blood Levels Not Correlated With Changes In Driving Performance. Toronto, Canada: The presence of THC in blood is not predictive of detriments in psychomotor performance, according to driving simulator data published in the journal JAMA Network Open
Marijuana-Impaired Driving (nhtsa.gov)
Having found differences between THC positive and THC negative drivers, the relationship between blood THC concentration and performance on tests for impairment was examined. Poor correlation between THC concentration and performance was found, which again indicates that blood THC level is not a reliable indicator of impairment. Finally, an assessment of whether the combination of the physiological, cognitive and psychomotor indicators could reliably predict whether the driver’s THC concentration was above or below 5 ng/ml threshold was conducted. No differences were found except for the finger-to-nose test. Some individual signs, symptoms, and tests had weak correlations with the THC concentration being above or below the threshold, but none of them met basic sensitivity levels for correctly predicting impairment status.
Marijuana-Impaired Driving (nhtsa.gov)
ecause there is a poor correlation between ∆9-THC bodily content and driving impairment, the Commission recommends against the establishment of a threshold of delta-9- THC bodily content for determining driving impairment.”
The failings of per se limits to detect cannabis-induced driving impairment: Results from a simulated driving study (theiacp.org)
THC Levels Not Correlated With Changes In Driving Performance (internationalcbc.com)
Is impairment correlated with peak THC blood levels?
No. “While fewer studies have examined the relationship between THC blood levels and degree of impairment, in those studies that have been conducted the consistent finding is that the level of THC in the blood and the degree of impairment do not appear to be closely related. Peak impairment does not occur when THC concentration in the blood is at or near peak levels. Peak THC level can occur when low impairment is measured, and high impairment can be measured when THC level is low. Thus, in contrast to the situation with alcohol, someone can show little or no impairment at a THC level at which someone else may show a greater degree of impairment.” Compton at p. 7.
Ik kan echt nog wel even doorgaan. Er is ook nog een rechtszaak geweest waarbij iemand was vrijgesproken omdat het niet bewezen kon worden dat de gemeten bloedwaarde gelijk stond aan impairment. Ik adviseer deze ook even op te zoeken.
Het is een graaibeleid, heeft niks te maken met verkeersveiligheid. Stond niks voor niks 2 maanden geleden nog een artikel over de CBR psychiater wat niet deugt en dat heb ik zelf ook één keer ervaren. De wachtkamers zitten vol en je betaald 300 euro voor 5 minuten. Vervolgens kun je weer doodleuk 11 maanden blowen, maandje stoppen, testen en weer door blowen. Als het echt om verkeersveiligheid ging, was dit wel steekproefsgewijs of waren het daadwerkelijk gesprekken professionals.
Het is gewoon allemaal niet zo simpel met THC als: jij hebt 6 microgram per liter bloed, jouw vaardigheden zijn verminderd. En 3 microgram is gewoon een veel te lage grenswaarde. Er zou maatwerk moeten zijn, net als bij alcohol. Maar bij blowen maakt het geen reet uit of je 20 joints hebt gerookt of 2 hijsjes. Even strafbaar boven de 3 microgram. Direct rijbewijs kwijt (voordat de nieuwe EMD er was). Laten we nou eerlijk zijn, wat is 3 microgram op een piek van 100-150.
