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Must a certifying scientist’s signature be on Copy 1 of the CCF if the drug test result is negative?
Part 40 Questions and Answers
Must a certifying scientist’s signature be on Co…
The certifying scientist’s signature must be on Copy 1 of the CCF for nonnegative results only.
Therefore, the certifying scientist may simply initial (and date) the CCF when the test result is negative.
DOT Part 40 Questions & Answers 1/2002