Research Papers

Effect of time on Blood Drug Concentrations for THC

Version 1
Date added July 9, 2018
Downloaded 0 times/fois
Category 2018 CARSP XXVIII Victoria
Tags Policy and Practice, Session 1A
Author/Auteur Abe Verghis
Stream/Volet Policy and Practice

Slidedeck Presentation Only (no paper submitted)

1A - Vergis


In Colorado, marijuana-related traffic deaths and injuries have increased over 48% in the three-year average (2013-2015) since Colorado legalized recreational marijuana compared to the previous years. In Canada, the government has proposed Bill C-46 to amend the Criminal Code of Canada and establish limits for blood drug concentrations (BDC) to help combat drug impaired driving. Under the proposed amendments, legislation has been drafted establishing limits for drugs detected within blood. It is well established that blood can only collected from the driver until approximately ~ 4 hrs after a road incident. This is particularly important for tetrahydrocannabinol (THC), the primary psychoactive component of Cannabis because of its pharmacokinetic profile. Blood THC concentration is the most reliable objective Cannabis exposure measure after saliva, with psychoactive THC concentration best reflecting potential impairing effects. However, there is a negative correlation between THC concentration in blood and collection time. With threshold (per-se) limits established in proposed amendments to the Criminal Code, any and all blood samples with low drug detection will have a major impact on successful prosecution of drug impaired driving. Law Enforcement, Jurisprudence, Lawyers, toxicologists, industry advocates, Government, Research; Policy Review Pharmacokinetics of Cannabinoids. Discuss collection times within various States that have an established blood collection system for drug impaired driving. Review challenges & outcomes especially within jurisprudence based on blood collection systems. Establish correlation between drug impairment in saliva and blood using various techniques. Review current protocols for blood draws within Canada and US. Provide direction on policy and research based on saliva collection systems for evidentiary confirmation. Outline benefits to law enforcement and law advocates regarding Oral Fluid test systems. Propose changes and other sanctions to the current proposed legislation.