Small GPS Devices Help Prosecutors Win Convictions

Like millions of motorists, Eric Hanson used a GPS unit in his Chevrolet TrailBlazer to find his way around. He probably didn't expect that prosecutors would eventually use it too — to help convict him of killing four family members.
Prosecutors in suburban Chicago analyzed data from the Garmin GPS device to pinpoint where Hanson had been on the morning after his parents were fatally shot and his sister and brother-in-law bludgeoned to death in 2005. He was convicted of the killings earlier this year and sentenced to death.
The growing popularity of GPS systems — in cars, cell phones and other handheld devices — gives authorities another powerful tool to track suspects.