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Social Networks Increased Risk Exposure
- Au pairs socialized in close-knit groups and relied on informal supports, which complicated tracking movements after nights out.
- Karina's weekend freedom to stay in Boston increased her exposure to unfamiliar risks away from Dover.
Controlled Killer Hypothesis
- Investigators believed the killer was careful and controlled rather than a chaotic 'maniac', possibly a stranger with a functional life.
- Forensic psychologists thought it resembled a first-time killer who planned disposal without panic.
Unofficial Placement Complicated Tracing
- Karina had been employed through an unofficial Stockholm agency and lacked proper visas, making her harder to trace in official systems.
- This irregular placement highlighted vulnerabilities of informal placement networks for young workers abroad.