Concentration of delta-9-tetrahydrocannabinolicacid A in hair after contamination by contact with cannabis material

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

DRKS

Registry ID

DRKS00005115

Enrollment

Registered

2013-07-24

Start date

2013-08-01

Completion date

Unknown

Last updated

2025-10-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

toxicological hair analysishealthy participants

Interventions

Group 1: Handling of marijuana plant material: ten volunteers roll one joint daily over five days and follow afterwards their daily schedule.

Eligibility

Sex/Gender

All

Age

18 Years to No maximum

Inclusion criteria

Inclusion criteria: Minimum hair length of 3 cm

Exclusion criteria

Exclusion criteria: Hair length shorter 3 cm consumption of cannabis products within the last six months strong exposition to cannabissmoke within the last 6 months

Design outcomes

Primary

Measure	Time frame
LC-MS/MS analysis of THCA-A and THC in hair samples of participants (sampling schedule: day zero; end of the exposure period (end of week 1); 1 month after the first exposure.	—

Secondary

Measure	Time frame
Comparison of the results with data from forensic hair samples	—

Countries

Germany

Contacts

Public ContactVolker Auwärter

Universitätsklinikum Freiburg / Rechtsmedizin Forensische Toxikologie

volker.auwaerter@uniklinik-freiburg.de07612036862

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: Feb 4, 2026