The number of known serial killers in the United States has fallen sharply since the 1970s and 1980s. Nearly 770 serial killers operated in the U.S. throughout the 1980s, and just under 670 in the ’90s, based on data compiled . Researchers link the decline to advances in DNA testing, surveillance cameras, digital records, improved forensic science, and greater public awareness. The rough estimate on the global rate appeared to show a similar drop over the same period.
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