A Seffner man is now facing a large federal find for using a jamming device to block phone calls.
The Hillsborough County Sheriff's Office assisted in the investigation.
Major Clyde Eisenberg says deputies teamed with investigators from the Federal Communications commission to track down Jason R. Humphreys.
"This device is highly illegal. It's illegal by state law and also by federal law, and nobody has any business owning one of these things," said Eisenberg.
Eisenberg says federal authorities noticed that one cell phone tower near I-4 and County Road 579 was being affected every day at the same time. The tower is owned by Metro PCS.
Eisenberg says when deputies tracked down Humphreys, they made a disturbing discovery.
"The first thing that happened is the deputy's radio shut down. This device shuts down all public safety communications and radios. The deputy was unable to communicate with his partner who was also assisting," said Eisenberg.
The FCC says the jammer being used by Humphreys is danger to public safety. Hillsborough deputies say its one of the largest they've confiscated.
Eisenberg says the device was in Humphreys' car, and he told deputies he used it for one purpose.
"This individual stated that he used this device because he didn't like people talking on their cell phones while driving and he states be bought it on the internet and it came from China and he paid 150 dollars for it," said Eisenberg.
The FCC says jamming devices can be easily purchased on the internet, but are illegal for any US citizen to own.
Humphreys now faces a fine of $48,000 by the Federal Communications Commission for possession and use of the device over 3 days in May 2013.