According to firearmchronicles
For political reasons, local law enforcement agencies were not included. In some of those jurisdictions, such as the Yakima Police Department and Vancouver Police department, all guns are destroyed for political reasons.
A bill to allow the State Police to destroy legal guns passed the House in the Washington state legislature on 23 January 2020.
Selling or not selling the guns has no effect on the availability of guns because the guns are sold through licensed dealers. They are simply another gun in a dealer’s stock. Destroying guns that have ended up in police hands simply means the money goes to a gun manufacturer to produce another gun, instead of to the police.
The Washington State Patrol wants the bill to pass, and its intended changes are needed, communications director Chris Loftis said. “Current law allows other law enforcement agencies the option to destroy but is strict with WSP, stating that we must keep them for agency use or auction/trade with licensed dealers, who then will sell them to the public,” Loftis said in an email.