Every person offending against any of the provisions of law relating to bribery or corruption shall be a competent witness against another so offending and shall not be excused from giving testimony tending to criminate himself or herself.

Bribery and corruption: Chapter 9A.68 RCW.

Incriminating testimony not to be used: RCW 10.52.090.

Rights of accused persons: State Constitution Art. 1 s 9.