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When her baby girl takes an afternoon nap, or on those nights when she just can't sleep, Sarah Andrews, 32, tosses off her identity as a suburban stay-at-home mom and becomes something more exotic: a "virtual deputy" patrolling the U.S.-Mexico border.
When Andrews spots something she deems suspicious -- perhaps a fuzzy character moving from right to left across the screen or people wading through the river with what appear to be trash bags atop their heads -- she and the site's 43,000 registered users can send e-mail messages straight to local law enforcement, who then decide whether to act.