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Jul 1, 2003 12:00 PM

The United States Department of Transportation (DOT) has issued an interim final rule to prevent employees in transportation industries who may naturally produce highly dilute urine specimens from being unfairly found to have violated DOT regulations.

This rule expands the definition of “dilute tests” and changes the amount of creatinine in a urine specimen that triggers a finding that the individual has refused to take a drug test.

Under current DOT rules, which are directly taken from the Department of Health and Human Services (HHS) program documents, a urine specimen with five milligrams of creatinine per deciliter of urine or less is regarded as “substituted.” A “substituted” test is considered a refusal to take a drug test, a violation of DOT rules equivalent to failing a drug test. The new rule takes effect immediately.