https://apnews.com/e46955ef1e9b46998521218f91df2806

COLUMBIA, S.C. (AP) — Federal officials say they oversaw a test this week of a jamming technology some hope will help combat the threat posed by inmates with smuggled cellphones.

Department of Justice officials tell The Associated Press the test took place over the course of five days at a maximum-security prison in South Carolina. Assistant Attorney General Beth Williams says it's the first time federal officials have collaborated with officials at a state prison for such a test.