49 cfr part 40 - §40.99 how long does the laboratory retain specimens after testing?
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49 cfr part 40 - §40.323
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49 cfr part 40 - §40.91 what validity tests must laboratories conduct on primary specimens?
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49 cfr part 40: 40.155 what does the mro do when a negative or positive test result is also dilute?
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what is 49 cfr part 40?