Welcome to our Ask The Cannabist column. Clearly you have questions about marijuana, be it a legal concern, a health curiosity, a Colorado-centric inquiry or something more far-reaching. Check out our expansive, 64-question Colorado marijuana FAQ first, and if you’re still curious, email your question to askthecannabist@gmail.com.
Hey, Cannabist!
How long does THC persist in the bloodstream above the legal 5 nanogram driving limit? Could THC in the bloodstream be above the legal limit a day or a few days later? –Dank Doobie Driver
Hey, Dank Doobie!
Thatap a great question! I’m sure you’re asking because 5 nanograms is the for driving while impaired in Colorado. The standard for marijuana impairment is not simple to understand. The short answer is yes, it is possible to have elevated levels of THC in the blood days after consuming marijuana, if you are a frequent consumer.
According to medical marijuana physician : “In early, classic research studies involving recreational marijuana users, THC appears in the blood very soon after consumption, whether by inhalation or ingestion, and its blood levels peak relatively soon thereafter, declining and disappearing within a very few hours.” However, there’s a caveat: “If you are a regular and frequent consumer, you’ll have elevated levels of THC in the blood.”
Dr. Shackelford summarizes that the absorption and metabolism of THC is very different for high-dose or frequent cannabis users. “THC and its metabolites may be present and detectable in blood samples for many hours to many days after cannabis use. Furthermore, blood levels of THC do not correlate in any predictable way with any degree of impairment or with time after use, even in infrequent users, but especially in patients or others who use marijuana regularly.”
Research is needed; we simply don’t have enough data right now to know how long THC remains in the bloodstream compared with actual impairment levels. Earlier this year, the on marijuana DUID charges, calling for proof of impairment, not just presence of THC in blood. At a , U.S. Rep. John Mica, a Florida Republican, said: “We have no standard. We have no acceptable test. We have no way of telling if people are impaired.”
Colorado needs a public service guide like the for estimating impairment. used for state law enforcement training to spot stoned drivers and public education campaigns should also be used for this purpose in the future.
Related
Hey, Cannabist!
When is the date for the next Cannabis Cup in 2015? –Globby Globe Get-together
Hey, Globby Globe!
Nowadays, , all over the country in medical and recreational states.
“April 18-20 are the dates for the 2015 Denver Cup,” shares Cannabis Cup event designer in a recent phone call.
A stop in early September and the original Amsterdam Cup in November wrap up the festivities for 2014.
The Cup calendar begins again in February at Los Angeles, followed by the largest of the Cannabis Cups — Denver for 4/20, then San Francisco in June, and Clio, Michigan in July. XO
Hey, Cannabist!
When Washington started recreational sales on July 8, starting top-shelf prices were at $25/gram. How much have Colorado’s rec prices dropped since January 1? Thanks. –Seattle Sensi Smoker
Hey, Seattle Sensi!
Well, prices haven’t gone down much in Colorado since Jan. 1, but for the most part, they are not as high as $25/gram for flowers, either! I talked to the owners of Northern Lights Cannabis Co. and 3D Cannabis Center, among the marijuana centers that were open for Colorado’s first recreational sales. Per-gram prices vary from about $10 to $15, pretax, depending on the amount purchased.
Eva Woolhiser of says her shop has added pricing tiers, including lower prices from the ones established at the first of the year. The following price breakdowns are all pretax: 3.5 grams (an eighth) of flowers goes for $48 or $54, for a per-gram price of $13.71 or $15.43. An ounce costs $300 to $350, bringing the per-gram price in the range of $10.71 to $12.50.
Toni Fox of says 3D’s prices have not changed since Jan. 1. An eighth of flowers costs $35 to $50; per-gram thatap $10 to $14.29. Packages of edibles containing 100 milligrams THC cost between $15 to $20. XO
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