Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Finding cannabinoids in hair does not prove cannabis consumption

07.10.2015

THC is not incorporated into human hair in relevant amounts after systemic uptake / THC metabolites may be transferred to other persons via sweat and sebum during close body contact / Scientists of the Medical Center – University of Freiburg publish a groundbreaking study in Scientific Reports

According to the common doctrine detection of THC metabolites in hair is regarded as an incontestable proof of cannabis consumption. Experimental studies conducted by the group of Prof. Volker Auwärter, forensic toxicologist at the Institute of Forensic Medicine in Freiburg, Germany, now showed that this conclusion is not correct. The results were published in the renowned scientific journal Scientific Reports of the Nature Publishing Group.

Detection of THC in hair is extensively used for abstinence control in workplace drug testing and in child protection cases. The new data prove that incorporation of THC does not occur via the blood stream after systemic uptake.

In cases of doubt, a THC metabolite was used to unequivocally prove cannabis consumption. However, this metabolite may be transferred to non-consuming persons by sebum and sweat. In order to confirm this, two of the authors conducted a self-administration study with daily ingestion of THC over 30 days and comprehensive analytical investigations.

“Our findings are of particular importance for hair analysis in the context of child custody because transfer of cannabinoids is very likely during close body contact and may lead to wrong conclusions with severe consequences”, Prof. Auwärter emphasizes. In countries with work place drug testing programs or pre-employment drug screenings false interpretations could result in job loss or exclusion from the application process, says the expert.

In earlier studies, the scientists from Freiburg have shown that passive cannabis smoke exposition leads to a persistent THC contamination of the hair not removable by multiple hair washes. Furthermore, even sole handling of cannabis material results in transfer of relevant amounts of cannabinoids onto the hair.

Title of the original paper: Finding cannabinoids in hair does not prove cannabis consumption

DOI: 10.1038/srep14906

Link to the online article: www.nature.com/articles/srep14906 

Contact:
Prof. Dr. Volker Auwärter
Forensic Toxicology
Institute of Forensic Medicine
Medical Center – University of Freiburg
Telephone: +49 761 203-6867
volker.auwaerter@uniklinik-freiburg.de

Weitere Informationen:

http://www.uniklinik-freiburg.de/nc/presse/pressemitteilungen/detailansicht/pres...

Benjamin Waschow | idw - Informationsdienst Wissenschaft

Further reports about: THC blood stream cannabinoids cannabis consumption contamination hair

More articles from Health and Medicine:

nachricht Satellites, airport visibility readings shed light on troops' exposure to air pollution
09.12.2016 | Veterans Affairs Research Communications

nachricht Oxygen can wake up dormant bacteria for antibiotic attacks
08.12.2016 | Penn State

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>