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Now Playing: 12-20-12 Marketplace Tech Report

There are apps that let stalkers track their victims. Now there's a move in Washington to outlaw them. And while they're at it, some members of Congress would like us all to have a clear idea of which pieces of software for a smartphone keep track of our physical location. One of the sponsors of new legislation that has just come out of committee is Senator Al Franken, Democrat of Minnesota.