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.
49 C.F.R. § 40.169