Washington State has an interesting provision: 5.60.040 Conviction of crime—Effect. No person offered as a witness shall be excluded from giving evidence by reason of conviction of crime, but such conviction may be shown to affect his credibility: Provided, That any person who shall have been convicted of the crime of perjury shall not be a competent witness in any case, unless such conviction shall have been reversed, or unless he shall have received a pardon. An accused giving evidence may be cross-examined regarding previous convictions: see State v. Roberts (1980), 25 Wash. App. 830, 611 P. 2d 1297.
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