RCW 26.44.190: Investigation of child abuse or neglect—Participation by law enforcement officer.

A law enforcement agency shall not allow a law enforcement officer to participate as an investigator in the investigation of alleged abuse or neglect concerning a child for whom the law enforcement officer is, or has been, a parent, guardian, or foster parent. This section is not intended to limit the authority or duty of a law enforcement officer to report, testify, or be examined as authorized or required by this chapter, or to perform other official duties as a law enforcement officer.