The bill amends RCW 26.44.030 to extend the investigation period for certain child welfare cases involving children under four years old, particularly in situations where high-potency synthetic opioids are present. It allows the Department of Children, Youth, and Families to extend the standard 90-day investigation period for up to nine months if the case does not meet the threshold for removal under RCW 13.34.050. The department is also required to collaborate with stakeholders to develop policies regarding the appropriate length of engagement and service interventions. Additionally, the bill mandates that family assessments must be completed within 45 days of receiving a report, with a possible extension to 120 days if agreed upon by the parents.

Moreover, the bill introduces provisions for voluntary services to families, including referrals to community-based intensive home visiting programs, contingent upon parental agreement. It establishes protocols for interviewing children during investigations while ensuring timely parental notification. The bill also requires the office of the family and children's ombuds to report to the legislature and governor by November 15, 2029, on cases involving children under four that remain open for more than 90 days when high-potency synthetic opioids are involved, with the reporting requirement set to expire on April 1, 2030.