Original Article

International Journal of Legal Medicine

, Volume 130, Issue 3, pp 711-721

First online:

The effect of cannabis on regular cannabis consumers’ ability to ride a bicycle

  • Benno HartungAffiliated withInstitute of Legal Medicine, University Hospital Düsseldorf Email author 
  • , Holger SchwenderAffiliated withInstitute of Mathematics, Heinrich-Heine-University
  • , Eckhard H. RothAffiliated withAugenzentrum Friedrichstadt
  • , Florence HellenAffiliated withDepartment of Psychiatry, Heinrich-Heine-University
  • , Nona MindiashviliAffiliated withInstitute of Legal Medicine, University Hospital Düsseldorf
  • , Annette RickertAffiliated withInstitute of Legal Medicine, University Hospital Düsseldorf
  • , Stefanie Ritz-TimmeAffiliated withInstitute of Legal Medicine, University Hospital Düsseldorf
  • , Almut GrieserAffiliated withDepartment of Anaesthesiology, University Hospital Düsseldorf
  • , Fabio MonticelliAffiliated withInstitute of Legal Medicine, Paris-Lodron-University
    • , Thomas DaldrupAffiliated withInstitute of Legal Medicine, University Hospital Düsseldorf

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Abstract

To assess the effects of cannabis on the ability required to ride a bicycle, repetitive practical cycling tests and medical examinations were carried out before and after inhalative consumption of cannabis. A maximum of three joints with body weight-adapted THC content (300 μg THC per kg body weight) could be consumed by each test subject. Fourteen regular cannabis-consuming test subjects were studied (12 males, 2 females). In summary, only a few driving faults were observed even under the influence of very high THC concentrations. A defined THC concentration that leads to an inability to ride a bicycle cannot be presented. The test subjects showed only slight distinctive features that can be documented using a medical test routinely run for persons under suspicion of driving under the influence of alcohol or drugs.

Keywords

Cannabis THC Bicycle Ability to ride Ability to drive Driving under the influence DUI Cannabis influence factor CIF