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Has the Most Common Marijuana Test Resulted in Tens of Thousands of Wrongful Convictions?

More than 800,000 people are arrested on marijuana charges each year in the United States, many on the basis of an error-prone test.

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John Kelly is a court-certified expert witness on drug tests and author of 'False Positives Equal False Justice' and the forthcoming book, 'How to Obtain a Pretrial Dismissal of Marijuana Charges or an Acquittal.' He can be contacted at: