That link doesn't appear to say that blood tests are reliable
Literally in the summary
> While blood alcohol content (BAC) level represents an accurate measurement of alcohol impairment, the presence of THC in a driver’s body has not been shown to be a predictable measure of cannabis impairment.
But further on
> Because THC in the blood can result from both recent as well as past use, impairment cannot be inferred from blood levels.
It is not a reliable indicator of recent use though, since it can also indicate past use.
I agree we need to set a threshold for impairment. I just want that to be measured reliably so that people who had a brownie last weekend aren't getting in trouble.
Driving isn’t a right. No matter how steeped the US is in car culture, it’s important not to lose sight of this.
Now blood tests show a 12-24 hour window of usage. Much tighter than the 2 to 30 days of other tests. In terms of window of time, that’s essentially good-enough.
Of course anyone who consumes cannabis has a strong desire for a tighter and more accurate test, but you’re really fighting against growing masses of irresponsible users.
If the problem is truly wide-spread like alcohol was (and still is), it’s just a matter of time before states or feds push for a good-enough (for the rest of us) solution.
THC leaves the bloodstream within 24 hours just to be clear.
I know this is a giant hairball and the downvotes and passionate discussion is why I said what I said but in the end, until we have a breathalyzer for THC, it is what it is.
That link doesn't appear to say that blood tests are reliable
Literally in the summary
> While blood alcohol content (BAC) level represents an accurate measurement of alcohol impairment, the presence of THC in a driver’s body has not been shown to be a predictable measure of cannabis impairment.
But further on
> Because THC in the blood can result from both recent as well as past use, impairment cannot be inferred from blood levels.
That’s not the relevant bit. A blood test detects recent use of THC.
Which other, less invasive methods cannot. Like alcohol, impairment is highly individual and so we set a threshold.
It is not a reliable indicator of recent use though, since it can also indicate past use.
I agree we need to set a threshold for impairment. I just want that to be measured reliably so that people who had a brownie last weekend aren't getting in trouble.
Driving isn’t a right. No matter how steeped the US is in car culture, it’s important not to lose sight of this.
Now blood tests show a 12-24 hour window of usage. Much tighter than the 2 to 30 days of other tests. In terms of window of time, that’s essentially good-enough.
Of course anyone who consumes cannabis has a strong desire for a tighter and more accurate test, but you’re really fighting against growing masses of irresponsible users.
If the problem is truly wide-spread like alcohol was (and still is), it’s just a matter of time before states or feds push for a good-enough (for the rest of us) solution.
THC leaves the bloodstream within 24 hours just to be clear.
I know this is a giant hairball and the downvotes and passionate discussion is why I said what I said but in the end, until we have a breathalyzer for THC, it is what it is.