Call For A Free Consultation 425-576-0026


Some Forensic Blood Tests can mistake CBD for THC

Posted by Howard Stein | Oct 15, 2019 | 0 Comments

CBD or cannabidoil is the legal and non intoxicating derivative of marijuana.  It is used to treat pain, inflammation and other maladies including seizure disorders.  But some forensic tests confuse CBD with Tetrahydroacannabinol THC the intoxicating and federally restricted product. It is important to know whether a reported test for THC is correct or whether it can mistakenly report CBD as THC. 

From today's New Your Times:

The drug testing method in question involves a common chemical analysis device called a gas-chromatography mass-spectrometry, or GC-MS, machine. Most such devices require the drug testing lab to add a chemical to a sample in order to identify trace amounts of illicit compounds, in a process called derivatization. Labs can perform derivatization using a variety of chemical agents, but one of the most common is called trifluoroacetic anhydride, or TFAA.

 According to the 2012 journal article, TFAA when used by a GC-MS machine was unable to discern between CBD and THC. If a person who used only CBD were given a drug test that employed this device, method and chemical, the results would falsely report the presence of THC

About the Author

Howard Stein

[email protected] Firm Partner, Personal Injury, and Criminal Defense Attorney Howard Stein has been practicing law for over 30 years in Washington State. He has experience as a prosecutor, defense attorney, attorney fighting for those who have been injured and as a judge pro tem. He also teaches other attorneys ...


There are no comments for this post. Be the first and Add your Comment below.

Leave a Comment

Contact Us

Request a free case consultation with one of our Bellevue lawyers. Call (425) 576-0026 now!