Six essays
The long version of what the front page shows in a line. Each opens on a documented event, then follows the research. Start anywhere.
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The long approach
Grooming is the slow work before abuse: access, trust, isolation, secrecy. Offenders describe it plainly. Researchers find almost nobody can see it while it happens.

Forty points
The Psychopathy Checklist is scored from 0 to 40 by a person, from an interview and a file. The same file can come back with different numbers depending on who is paying.

The walk
In 1981 researchers filmed people walking down a New York street and asked inmates convicted of assault who they would pick. Their answers were consistent. The research is about the reader, not the walker.

The print on the bag
In 2004 the FBI matched a fingerprint from the Madrid train bombings to an Oregon lawyer. Four experts agreed. It was not his. The Inspector General's report shows how good examiners talked themselves into it.

Cold and hot
Most violence is hot: a threat, a surge, an attack that is over in minutes. A smaller share is cold: planned, quiet, aimed. Forensic science treats them as two different things, and the difference shows up in the files.

The profile and the common
In 1992 a psychologist's profile shaped a London murder investigation around the wrong man. The research since says most claims in real profiles cannot be checked, and profilers barely beat everyone else.