30 CFR § 50.12
Preservation of evidence.
Unless granted permission by a MSHA District Manager,
no operator may alter an accident site or an accident related area until
completion of all investigations pertaining to the accident except to the
extent necessary to rescue or recover an individual, prevent or eliminate an
imminent danger, or prevent destruction of mining equipment.
[42 FR 65535, Dec. 30, 1977; 43 FR 1617, Jan. 11, 1978]
Subpart C--Reporting of Accidents, Injuries, and Illnesses