Law enforcement agencies in dozens of cities and states have suitcase-sized surveillance tools that simulate cellphone towers such as this one and can track individual cellphones. But the devices can also disrupt emergency calls placed by individuals who are not being monitored. This week, a congressional committee called for legislation to set a national standard for their use.
Law enforcement agencies in dozens of cities and states have suitcase-sized surveillance tools that simulate cellphone towers such as this one and can track individual cellphones. But the devices can also disrupt emergency calls placed by individuals who are not being monitored. This week, a congressional committee called for legislation to set a national standard for their use. Nati Harnik AP
Law enforcement agencies in dozens of cities and states have suitcase-sized surveillance tools that simulate cellphone towers such as this one and can track individual cellphones. But the devices can also disrupt emergency calls placed by individuals who are not being monitored. This week, a congressional committee called for legislation to set a national standard for their use. Nati Harnik AP

Police’s secret cellphone-surveillance tool can also block calls by the innocent

December 21, 2016 04:02 PM

UPDATED December 27, 2016 10:56 AM

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