22/04/2010
Mapping Drug Addicts' Tracks
Zdroj: U.S. News Science |
A map traced the steps of a single man, a drug addict, as he traveled through Baltimore.
The man carried a GPS unit, given to him by clinicians who were treating him at a methadone clinic. The unit, about the size of a thick domino, tracked his motion every time he moved 25 meters, or every 25 minutes if he was still.
The researchers also gave the man a handheld personal digital assistant, or PDA, so that he could answer questions about his drug use.
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