According to a memo obtained by CNN, the Pentagon authorized a seven-month loan of one Active Denial System to DHS beginning in September, allowing testing and tactics development for possible use at the southern border. The electromagnetic device causes a heating sensation on skin, and DHS is responsible for operation and procedures. The request did not specify test locations, methods or final deployment arrangements. Earlier discussions raised legal questions, direct injury and indirect harm such as drowning if people were driven toward water. The report does not establish actual use against migrants.