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Canada and Cannabis

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Canada and Cannabis

Old 6th Jun 2019, 15:24
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Canada and Cannabis

New rules for flight crew in Canada:

https://www.cbc.ca/news/business/tra...abis-1.5164518


Members of the Canadian aviation industry are forbidden from consuming cannabis for at least 28 days before going on duty, according to new rules now in force.

Canadian Aviation Regulations require that pilots, cabin crew, and air traffic controllers must have a certain level of "fitness for duty" on the job, Transport Canada said Thursday. That means they cannot use or be "under the influence of any drug that impairs the person's faculties to the extent that aviation safety is affected," the agency said.

As such, four weeks is the minimum time required to be free of cannabis before being allowed to work, the aviation regulator said. But the new rules don't preclude airlines or airports from requiring even stricter requirements of their employees.

After the government legalized recreational use of cannabis last fall, Transport Canada undertook a review of its policies with regards to impairment.

The new rules in keeping with what Department of National Defence and the Royal Canadian Mounted Police have come up with for their workers, and "aligned with the best available science," the agency said.

The rules are in place "effective immediately," Transport Canada added.




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Old 6th Jun 2019, 15:36
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Originally Posted by hr2pilot View Post
After the government legalized recreational use of cannabis last fall, Transport Canada undertook a review of its policies with regards to impairment.

The new rules in keeping with what Department of National Defence and the Royal Canadian Mounted Police have come up with for their workers, and "aligned with the best available science," the agency said.

The rules are in place "effective immediately," Transport Canada added.

For those interested, a medical treatment of the rate of elimination of the active ingredient.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2587336/
This finding may have informed the length of time chosen by the Canadian authorities.
and "aligned with the best available science," the agency said.
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Old 6th Jun 2019, 17:47
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Twenty eight days, eh.
Oh my.... In the 1970's and 80's there would have been many days when half the ATC staff in BC would have been working in circumstances nowhere near in compliance with the new regs.
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Old 6th Jun 2019, 19:35
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Does that NIH study imply actual impairment with those levels of that metabolite? WA uses a different test:
For marijuana use in Washington and Colorado, the current limit is 5 nanograms of delta-9-THC per milliliter of blood. If a driver is found with a THC level at or over that limit, they can be arrested and charged without proof of impairment due to another substance.
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Old 6th Jun 2019, 20:12
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In the 1970's and 80's there would have been many days when half the ATC staff in BC would have been working in circumstances nowhere near in compliance with the new regs.
Well, now they know!
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Old 6th Jun 2019, 22:00
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The cited study shows that it can take 28 days for a large concentration of THC to be eliminated after heavy consumption, especially with a high BMI which results in a slow release from fatty tissues. Thin users with a low THC concentration show below threshold after 5.6 days.

This study does not in any way link impairment to THC levels.

Is there any such study out there?
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Old 6th Jun 2019, 23:20
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Thin users with a low THC concentration show below threshold after 5.6 days.
An additional reason to lose weight!
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Old 7th Jun 2019, 07:25
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Originally Posted by RatherBeFlying View Post
The cited study shows that it can take 28 days for a large concentration of THC to be eliminated after heavy consumption, especially with a high BMI which results in a slow release from fatty tissues. Thin users with a low THC concentration show below threshold after 5.6 days.

This study does not in any way link impairment to THC levels.

Is there any such study out there?
in the great USA the limit for anything with an aviation licence is still basically zero, since Pot is still illegal at the federal level, and aviation certificates are issued at the federal level....wonder when America will wake up
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Old 7th Jun 2019, 08:00
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I can still feel the effects fifty years after I last, ahem, inhaled. Now, what was I saying...?
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Old 7th Jun 2019, 08:42
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Never tried it, never felt the need. Alcohol, cigarettes and sex have proved quite sufficient for my personal contentment. YMMV.
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Old 7th Jun 2019, 09:50
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The authorities are really struggling over how to monitor usage. The 28 day rule does seem daft. The ▵9-THC concentration rapidly decreases to 1-4 ng/mL within 3-4 hour after smoking and this seems to relate to lack of clinical symptoms that might cause incapacitation. However if you eat it, the drug is absorbed in the fat and the effective plasma half life for frequent users is 13 days. In medicine we consider a drug to be ineffective after five half lives which is 65 days, but this is an average and might be 90 days in 5% of the population. Nobody is suggesting one marijuana cupcake makes you high for 3 months sadly but it may give positive toxicology results even though in Canada the pilot would be legal!!!! The paper referred to by T28B measures THCCOOH which is an inactive metabolite.

The rule will be 28 days because as often happens the rules are made by the regulator and dont need any scientific basis nor common sense, but the forensic toxicologists and lawyers may well grow rich on the court cases....
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Old 7th Jun 2019, 09:51
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Originally Posted by MPN11 View Post
Never tried it, never felt the need. Alcohol, cigarettes and sex have proved quite sufficient for my personal contentment. YMMV.

so??? are we impressed?? on should try it..not like one becomes a raging addict...alcoh and tobacco not any better for you..
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Old 7th Jun 2019, 10:51
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Originally Posted by ironbutt57 View Post
so??? are we impressed?? on should try it..not like one becomes a raging addict...alcoh and tobacco not any better for you..
Apologies for injecting humo[u]r. Have a nice day.
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Old 7th Jun 2019, 11:53
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Originally Posted by MPN11 View Post
Apologies for injecting humo[u]r. Have a nice day.
Who says cannabis is harmless? See how quickly this thread has gone from just smoking a bit of weed to injecting? !!

Last edited by pilotmike; 7th Jun 2019 at 17:43.
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Old 7th Jun 2019, 12:01
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good one, thanks pm!
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Old 7th Jun 2019, 12:08
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I work with a bloke with a heavy habit, swears it doesn't affect him, but I watched a full on 5 minute psychotic breakdown because... somebody had swapped his green plastic file to a red one and he hates red.... but nooooooo it doesn't affect him!

G
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Old 7th Jun 2019, 14:32
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4 weeks is about the longest you will still test positive for after use, however running a full battery of tests on a heavy user can show usage going back even further.
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Old 7th Jun 2019, 20:22
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As others have noted above - being able to detect a tiny amount of a metabolite of a drug does not mean someone is currently experiencing its psychoactive effects.

E.g. it is possible to have urine test positive for opiates, hours after eating food containing poppy seeds - although this is more likely with poppy seed cake (with loads of seeds) than with rolls/bagels (just sprinkled with them).

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Old 7th Jun 2019, 20:54
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Originally Posted by krismiler View Post
4 weeks is about the longest you will still test positive for after use, however running a full battery of tests on a heavy user can show usage going back even further.
I should have been more clear in my post. Since this is a pilot's forum, and getting a positive result on a test could harm a pilot's livelihood, I thought that the study on how long it lingers would be useful information for pilots. I suspect that the chosen cooling off period may be related to that, but I do not know for a fact.
I do not have answers to what Intruder and RatherBeFlying asked about.
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