Hargrove's two-thousand estimate is based on FBI homicide data. The FBI currently has 1,400 unsolved murders and each is DNA linked to other killings.
Hargrove developed his own data crunching based on method, place, time, and victim gender and unusual rates of unsolved murders.
Consider the cases in Lake County, Indiana in 2010. Between 1980 and 2008, fifteen women were strangled and dumped in vacant houses.
Hargrove asked the cops whether they suspected a serial killer. The cops ignored him until Darren Vann was arrested. 'Over several days, he [Vann] takes police to abandoned buildings where they
recover the bodies of six women, all of them strangled, just like the
pattern we were seeing in the algorithm,' Hargrove noted.
