Smoked Marijuana Improved ADHD Driver's Performance
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by: Strohbeck-Kuehner P, Skopp G, Mattern R.
Arch Kriminol 2007;220(1-2):11-9.
Cannabis normalized impaired psychomotor performance and mood in a patient with hyperactivity disorder
Scientists at the Department for Forensic and Traffic Medicine
of the University of Heidelberg, Germany, investigated the
effects of cannabis on driving related functions in a 28 year old
man with attention-deficit/hyperactivity disorder (ADHD). He
had violated traffic regulations several times in recent years and
his driving licence was revoked due to driving under the
influence of cannabis. He showed abnormal behaviour, seemed
to be significantly maladjusted and his concentration was heavily
impaired while sober during the first meeting with a psychologist.
He was allowed to perform driving related tests under the
influence of the cannabis compound dronabinol (THC), which
his doctor had prescribed him to treat his symptoms. The
examiner expected that he was not able to drive a car under the
acute influence of THC.
But at the second visit his behaviour was markedly improved
and he performed average and partly above-average in all tests
on reaction speed, sustained attention, visual orientation,
perception speed and divided attention. A blood sample taken
after the tests revealed a high THC concentration of 71 ng/ml in
blood serum. He admitted later to have smoked cannabis and
not taken dronabinol, because it was too expensive.
Researchers noted that "people with ADHD are found to violate
traffic regulations, to commit criminal offences and to be
involved in traffic accidents more often than the statistical norm"
and conclude from their investigation that "it has to be taken into
account that in persons with ADHD THC may have atypical and
even performance-enhancing effects."
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