RCW 9A.72.150
Tampering with physical evidence.
(1) A person is guilty of tampering with physical evidence if, having reason to believe that an official proceeding is pending or about to be instituted and acting without legal right or authority, he or she:
(a) Destroys, mutilates, conceals, removes, or alters physical evidence with intent to impair its appearance, character, or availability in such pending or prospective official proceeding; or
(b) Knowingly presents or offers any false physical evidence.
(2) "Physical evidence" as used in this section includes any article, object, document, record, or other thing of physical substance.
(3) Tampering with physical evidence is a gross misdemeanor.
[ 2011 c 336 § 397; 1975 1st ex.s. c 260 § 9A.72.150.]
Structure Revised Code of Washington
Title 9A - Washington Criminal Code
Chapter 9A.72 - Perjury and Interference With Official Proceedings.
9A.72.020 - Perjury in the first degree.
9A.72.030 - Perjury in the second degree.
9A.72.050 - Perjury and false swearing—Inconsistent statements—Degree of crime.
9A.72.060 - Perjury and false swearing—Retraction.
9A.72.070 - Perjury and false swearing—Irregularities no defense.
9A.72.080 - Statement of what one does not know to be true.
9A.72.090 - Bribing a witness.
9A.72.100 - Bribe receiving by a witness.
9A.72.110 - Intimidating a witness.
9A.72.120 - Tampering with a witness.
9A.72.130 - Intimidating a juror.