Cannabis reports
Sir, —Congratulations on your article “Courts taking softer line on cannabis” (“The Press,” May 19). It is, however, incorrect to state that there has not been research into the effect of cannabis on driving. One example is “Marijuana Reconsidered,” by Dr Lester Grinspoon (associate clinical professor of psychiatry, Harvard Medical School). This discusses the effects of marijuana, compared with alcohol, on driving performance tested by a driving simulator. The experimental team found that
“subjects experiencing a social marijuana high” accumulated more speedometer errors than when under control conditions (sober), but there were no significant differences in errors with accelerator. brakes, signals, or steering. The same subjects intoxicated from alcohol accumulated significantly more errors with accelerator, brakes, signals, and speedometer than under normal conditions. The driving test lasted 23 minutes and had 405 checks. Marijuana users reported accelerations of time and speed perceptions which resulted in driving more slowly.—Yours, etc., J. J. LADBROOK-SMITH. May 19, 1977.
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Press, 23 May 1977, Page 16
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157Cannabis reports Press, 23 May 1977, Page 16
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