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Some personal injury law firms now automatically target online ads at anyone who enters a nearby hospital's emergency room and has a cellphone. The ads may show up on multiple devices for more than a month. sshepard/Getty Images hide caption

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Digital Ambulance Chasers? Law Firms Send Ads To Patients' Phones Inside ERs

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Companies are trying geofencing, which uses GPS and radio frequency identification to set up a virtual, wireless perimeter so that cellphone users in that area receive messages or advertisements on their phones. Rawpixel/Getty Images/iStockphoto hide caption

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Recruiters Use 'Geofencing' To Target Potential Hires Where They Live And Work

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