Pentagon bought device through undercover operation some investigators suspect is linked to Havana Syndrome

By Katie Bo Lillis, Natasha Bertrand, Priscilla Alvarez, Jim Sciutto, Zachary Cohen, CNN (CNN) — 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