"The big problem is the scant data they have to work with," said Rafael Ruiz Harrell, a criminologist.
Until recently, many prosecutions relied solely on a confession, often extracted under torture. Preserving a crime scene has only recently become standard procedure.
"It's just inexcusable that after fingerprints have been taken from a crime scene, they turn out to be the prints of police themselves. It happens all over Mexico," Ontiveros said.
RSS