Is Daubert or Frye used for expert witness testimony admissibility in Washington?
The state of Washington follows the Frye test for the admissibility of expert witness testimony. In re Detention of Pettis, 352 P.3d 841 (Wash. Ct. App. 2015). Under this test, expert witness testimony is admissible if “(1) the scientific theory or principles upon which the evidence is based has gained general acceptance in the [...]