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Published Online:https://doi.org/10.1176/ajp.125.3.379

The study reported here, designed to extend knowledge of the behavioral toxicity of marihuana, illustrates some of the problems involved in measuring the effects of such drugs. A number of performance tests proved insensitive to marihuana in the doses used. Effects on complex reaction time and on digit code memory tasks were impaired, but there were marked individual differences.

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