FILE - This 1978 file photo shows serial killer John Wayne Gacy. 

FILE - This 1978 file photo shows serial killer John Wayne Gacy. Cook County Sheriff Tom Dart says his officers and the FBI using high tech equipment and two dogs trained to sniff out human remains, went to the apartment complex of Gacy’s late mother in march 2013 and found nothing to indicate the serial killer stashed any bodies there. Dart has been investigating the serial killer who was convicted in 1980 of murdering 33 young men in the 1970s on a number of fronts the last couple years, including the exhumation of bodies of unidentified Gacy victims in the hopes DNA testing could identify them. (AP Photo/File)
Associated Press
FILE - This 1978 file photo shows serial killer John Wayne Gacy. Cook County Sheriff Tom Dart says his officers and the FBI using high tech equipment and two dogs trained to sniff out human remains, went to the apartment complex of Gacy’s late mother in march 2013 and found nothing to indicate the serial killer stashed any bodies there. Dart has been investigating the serial killer who was convicted in 1980 of murdering 33 young men in the 1970s on a number of fronts the last couple years, including the exhumation of bodies of unidentified Gacy victims in the hopes DNA testing could identify them. (AP Photo/File)
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