Qualitative interview study with 9 Swedish criminal investigators (from police regions Bergslagen, Nord, Väst, and Syd) examining what characterizes effective investigative work in cases involving particularly vulnerable victims (SUB), including intimate partner violence, sexual offenses, and crimes against children.
Effectiveness in SUB investigations depends on the interplay of early coordinated action, investigator experience, organizational support, and inter-agency collaboration — not resources alone. Key success factors identified: victim contact and first interview within 1–2 weeks, early suspect detention, structured initial crime scene measures, and engaged frontline leadership. The 'Dalarnamodellen' (a rotating 3-week schedule with dedicated investigation time and weekly multi-agency case reviews) in Region Bergslagen was the only explicitly named regional model and was linked to higher, more stable clearance rates.
- Small purposive sample (n=9 investigators from 4 regions); findings cannot be generalized to the full investigator population. - Study focused heavily on intimate partner violence against women; crimes against children and honor-related violence are underrepresented. - No quantitative data to test causal links between practices and clearance rates.
Early victim contact (ideally within one week), prompt assignment of legal counsel, and structured initial interviews are the actions investigators identify as most likely to improve case outcomes — prioritize these over expanding staff numbers alone. Police leadership should create formal structures for peer reflection and knowledge sharing, and actively include frontline investigators when implementing new protocols.
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