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]