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DOT Rule 49 CFR Part 40 Section 40.87

Subpart F - Drug Testing Laboratories

§ 40.87  What are the cutoff concentrations for drug tests?
(a) As a laboratory, you must use the cutoff concentrations displayed in the following table for initial and confirmatory drug tests. All cutoff concentrations are expressed in nanograms per milliliter (ng/mL). 
Initial test analyte Initial test cutoff concentration Confirmatory test analyte Confirmatory test cutoff concentration
Marijuana metabolites 50 ng/mL THCA1 15 ng/mL
Cocaine metabolites 150 ng/mL Benzoylecgonine 100  ng/mL
Opiate metabolites      
Codeine/Morphine2 2000 ng/mL Codeine 2000 ng/mL
    Morphine 2000 ng/mL
6-Acetylmorphine 10 ng/mL 6-Acetylmorphine 10 ng/mL
Phencyclidine 25 ng/mL Phencyclidine 25 ng/mL
AMP/MAMP4 500 ng/mL Amphetamine 250 ng/mL
    Methamphetamine5 250 ng/mL
   500 ng/mL MDMA 250 ng/mL
      MDA7 250 ng/mL
      MDEA8 250 ng/mL
1Delta-9-tetrahydrocannabinol-9-carboxylic acid (THCA).
2Morphine is the target analyte for codeine/morphine testing.
3Either a single initial test kit or multiple initial test kits may be used provided the single test kit detects each target analyte independently at the specified cutoff.
4Methamphetamine is the target analyte for amphetamine/methamphetamine testing.
5To be reported positive for methamphetamine, a specimen must also contain amphetamine at a concentration equal to or greater than 100 ng/mL.
6Methylenedioxymethamphetamine (MDMA).
7Methylenedioxyamphetamine (MDA).
8Methylenedioxyethylamphetamine (MDEA).
(b) On an initial drug test, you must report a result below the cutoff concentration as negative. If the result is at or above the cutoff concentration, you must conduct a confirmation test.
(c) On a confirmation drug test, you must report a result below the cutoff concentration as negative and a result at or above the cutoff concentration as confirmed positive.
(d) You must report quantitative values for morphine or codeine at 15,000 ng/mL or above.
[65 FR 79526, Dec. 19, 2000, as amended at 75 FR 49862, August 16, 2010; 77 FR 26473, May 4, 2012]
Updated: Wednesday, January 16, 2013