Modernizing and strengthening laws concerning sheriffs, police chiefs, town marshals, law enforcement agency volunteers, youth cadets, specially commissioned officers, and police matrons.

Prohibited law enforcement volunteers from enforcing civil immigration laws, expanding existing restrictions that only covered criminal laws.

Changed the vacancy filling procedure for sheriffs to follow the specific appointment rules found in RCW 36.16.110.

Updated the bill header to reflect its status as a 'Substitute Senate Bill' and adjusted the sponsoring body description.

Added mandatory age requirements and background investigations for appointed sheriffs, police chiefs, and town marshals, extending rules that previously only applied to elected officials.

Changed the department responsible for sheriff background checks from 'Senate Law & Justice' to 'Senate Ways & Means' and updated the reading date.

Expanded the list of authorized volunteer roles to explicitly include assisting with canine human remains detection, cadaver search, evidence search, and other search-oriented support.

Clarified that volunteers may use dogs for search and rescue, including specific investigative support tasks, while maintaining prohibitions on using dogs to track, apprehend, or bite people and animals.

Reorganized the background investigation section for sheriffs to streamline the process and clarify that verification results are public records.

Updated the effective date for new volunteer and youth cadet regulations to January 1, 2027, allowing time for local agencies to adopt necessary policies.