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Serial urine cannabinoid results showed a limited association with withdrawal symptoms in a selected inpatient population, but they did not provide a stand-alone measure of an individual’s symptoms or impairment. A positive urine result, a withdrawal assessment, and a determination of intoxication answer different questions. Claus and colleagues investigated 78…
Read Article: Can a Urine Cannabinoid Result Measure Cannabis Withdrawal Severity?
Testing frequent cannabis users the morning after smoking did not reveal worse average performance than controls on two cognitive tasks. Within the cannabis group, however, higher THC concentrations and higher-potency products were associated with poorer performance on selected measures. Those findings can coexist. Neither supports automatically labeling every driver impaired—or…
Read Article: Cannabis the Morning After: Why a Null Group Comparison Does Not Clear Every Driver
A small study of adults starting medical cannabis did not demonstrate a different change in simulated driving performance from matched controls over one month. It also did not establish that driving after cannabis is safe. The distinction matters when a study is offered to support an opinion about a particular…