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GPS Use Questioned By Peterson Defense

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Both sides in the Scott Peterson murder case will argue the merits of global positioning system technology, more commonly known as GPS, this morning.

Modesto police used a GPS tracking system to track Peterson for nearly four months after his wife, Laci, disappeared.

Defense lawyer Mark Geragos wants all the GPS tracking evidence thrown out.

Both Geragos and prosecutors face a gag order and neither side can comment on their strategy. But in court papers filed last October, Geragos argued that the

GPS technology is inaccurate and unreliable. Today´s hearing begins at 9:30.