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Columbia, S.C. — Federal officials this week oversaw the test at a South Carolina prison of a cellphone signal jamming technology that some hope will help combat the threat posed by inmates with smuggled cellphones, officials told The Associated Press.

The test took place over the course of five days in a housing unit at Broad River Correctional Institution, a maximum-security prison in Columbia, South Carolina, according to Department of Justice officials. Assistant Attorney General Beth Williams told AP it’s the first time federal officials have collaborated with officials at a state prison for such a test.

Officials did not release the results of the test, which will be included in a later report to be done by the National Telecommunications and Information Administration.

The test marks progress on the state-level quest to stamp out contraband cellphone use, which officials have long said represents the top security threat within their institutions. Micro-jamming technology was tested last year at a federal prison — where officials said they were able to shut down phone signals inside a prison cell, while devices about 20 feet away worked normally — but a decades-old law says state or local agencies don’t have the authority to jam the public airwaves.

South Carolina Corrections Director Bryan Stirling, who for years has spoken out on the dangers posed by the devices smuggled into institutions by the thousands, told AP he was recently deputized as a special deputy U.S. Marshal, thus giving him the federal status needed to conduct the jamming test.

“I’m very encouraged by what we witnessed at Broad River this week,” Stirling told AP on Friday, adding that he’s optimistic about federal legislation, introduced last month, that would give state prison officials the ability to jam signals.

In 2008, South Carolina officials received a waiver from the Federal Communications Commission to conduct a jamming test at a different prison, in a demonstration for media and other officials.

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