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Chemical Tests and Reliability Using chemical tests to prove that someone is driving under the influence of marijuana has three fundamental problems: There is no consensus on the extent to which cannabis can cause driving problems Chemical tests cannot reliably indicate when someone used marijuana They cannot reliably indicate how much has been used Test results may also vary based on the type of test used
There is a direct association between these warnings and increased smoking cessation and reduced smoking initiation and prevalence
For smokers, these misconceptions have real consequences
Citing Doll and Hill, the journal declared that the most reasonable interpretation of this evidence is that the relationship is one of direct cause and effect. Ronald Fisher begged to differ
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