WA HB1139

Reclassifies unlawful possession of a firearm in the first degree (RCW 9.41.040(1)) as a "violent offense" under Washington's Sentencing Reform Act, moving it from seriousness level VII to level VIII on the sentencing grid

Requires mandatory jail booking for persons arrested for unlawful firearm possession violations under RCW 9.41.040(1) or (2), adding this offense to the list requiring arrest and custody pending release

Adds a new offender score calculation requiring two points for each prior juvenile adjudication and adult conviction for unlawful possession of a firearm 1 or 2 when the current conviction is for either offense

Amends multiple sections of RCW including arrest authority (10.31.100), sentencing definitions (9.94A.030), the crimes seriousness table (9.94A.515), and offender score calculations (9.94A.525)

Contains phased implementation with certain sections expiring January 1, 2026, and replacement sections taking effect on that same date