MSHA - Code of Federal Regulations - 30 CFR 75.151
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MSHA - Title 30 CFR
30 CFR § 75.151
Tests for methane; qualified person; additional requirement.

Notwithstanding the provisions of §75.150, on and after January 1, 1971, no person shall be a qualified person for testing for methane unless he demonstrates to the satisfaction of an authorized representative of the Secretary that he is qualified to test for methane with a portable methane detector approved by the Bureau of Mines or the Mine Safety and Health Administration under Part 22 of this chapter (Bureau of Mines Schedule 8C).