Washington Post: A convicted sex offender being tracked as a suspect in a string of sexual assaults, did not have his rights violated when Fairfax police secretly placed a global positioning system (GPS) device on his vehicle without a warrant, the Virginia Court of Appeals ruled Tuesday. After 11 attacks on women in eastern Fairfax County in 2008, many in the Falls Church area, detectives zeroed in on David L. Foltz because he lived in the area and was previously convicted of rape. He had served 17 years in prison and was released in 2007.