25 CFR § 11.440 - Tampering with or fabricating physical evidence.
A person commits a misdemeanor if, believing that an official proceeding or investigation is pending or about to be instituted, he or she:
(a) Alters, destroys, conceals, or removes any record, document or thing with purpose to impair its verity or availability in such proceeding or investigation; or
(b) Makes, presents or uses any record, document or thing knowing it to be false and with the purpose to mislead a public servant who is or may be engaged in such proceeding or investigation.
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