The Defense Department has spent more than a year testing a device purchased in an undercover operation that some investigators think could be the cause of a series of mysterious ailments impacting US spies, diplomats and troops that are colloquially known as Havana Syndrome, according to four sources briefed on the matter. 0:00 CNN senior national security reporter on Havana Syndrome-linked device that was acquired by the Pentagon 3:18 Reporter reacts to the device being studied by the Pentagon 5:49 Marco Rubio’s push to get the Biden administration to investigate Havana Syndrome 7:17 Former CIA officer reacts to the news #HavanaSyndrome #Pentagon #News