Pete Hegseth, the US secretary of defense, reportedly signed a memo last month permitting the Department of Homeland Security (DHS) to test a non-lethal “heat ray” for potential use at the US southern border.
The “heat ray”, known as the Active Denial System, is a military-grade weapon that shoots an energy beam causing “a sensation of intense heat on the surface of the skin”, according to a 2009 National Defense University case study on the weapon.
