You can find more information concerning the role of MROs in several sections of this part:

§ 40.3—Definition. §§ 40.47-40.49—Correction of form and kit errors. § 40.67—Role in direct observation and other atypical test situations. § 40.83—Laboratory handling of fatal and correctable flaws. § 40.97—Laboratory handling of test results and quantitative values. § 40.99—Authorization of longer laboratory retention of specimens. § 40.101—Relationship with laboratories; avoidance of conflicts of interest. § 40.171—Request for test of split specimen. § 40.187—Action concerning split specimen test results. § 40.193—Role in “shy bladder” situations. § 40.195—Role in cancelling tests. §§ 40.199-40.203—Documenting errors in tests. § 40.327—Confidentiality and release of information. § 40.347—Transfer of records. § 40.353—Relationships with service agents.

[65 FR 79526, Dec. 19, 2000, as amended at 82 FR 52245, Nov. 13, 2017]