Crime Library: Criminal Minds and Methods

How Investigators Know What Evidence is Real and What’s Not

In 1991 a man claimed to have found a diary that revealed the identity of a serial killer. Experts said it was consistent with a killer’s mindset and the location of the attacks. It was signed May 3, 1989, Jack the Ripper, but it was a hoax. A look at how investigators determine what’s real and what isn’t.

Evidence Files: Most Famous Ransom Notes

For parents faced with the nightmare of a child snatched by a stranger, a ransom note left in the empty bassinet can serve as a beacon of hope. Here are five famous ransom notes from the cases that captivated America.

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