USC 18 § 1512. Tampering with a witness, victim, or an informant

(a)(1) Whoever kills or attempts to kill another person, with intent to—

(A) prevent the attendance or testimony of any person in an official proceeding;
(B) prevent the production of a record, document, or other object, in an official proceeding; or
(C) prevent the communication by any person to a law enforcement officer or judge of the United States of information relating to the commission or possible commission of a Federal offense or a violation of conditions of probation, parole, or release pending judicial proceedings;

shall be punished as provided in paragraph (3).

(2) Whoever uses physical force or the threat of physical force against any person, or attempts to do so, with intent to—

(A) influence, delay, or prevent the testimony of any person in an official proceeding;
(B) cause or induce any person to—

(i) withhold testimony, or withhold a record, document, or other object, from an official proceeding;
(ii) alter, destroy, mutilate, or conceal an object with intent to impair the integrity or availability of the object for use in an official proceeding;
(iii) evade legal process summoning that person to appear as a witness, or to produce a record, document, or other object, in an official proceeding; or
(iv) be absent from an official proceeding to which that person has been summoned by legal process; or…

(1) alters, destroys, mutilates, or conceals a record, document, or other object, or attempts to do so, with the intent to impair the object’s integrity or availability for use in an official proceeding; or
(2) otherwise obstructs, influences, or impedes any official proceeding, or attempts to do so,

shall be fined under this title or imprisoned not more than 20 years, or both.

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