1) they knew somebody had a device
2) they bought a device from somebody. is it the same as 1? how do we know?
3) they tested the device on mice, goats, something.
4) the subjects said they had headaches, in some manner.
one version of the story has "two agents walked into a coffeeshop" but instead of a punchline, its "a kid with a backpack on followed them in" and "they reeled in horror as their heads hurt" which is magically INCONTROVERTABLE PROOF the kid had a microwave weapon in his backpack.
I'd say in this day and age, anything is possible.
I tried to watch The Age Of Disclosure and, well… Everyone in it manages to stay relatively reasonable during the first fourth of the movie. Until they decide that the most likely explanation of all those unexplained phenomenons is a race of technologically advanced extraterrestrials hiding at the bottom of the ocean for thousands of years.
It went from "we don't know anything" to "it's threatening aquatic ETs" in a heartbeat. It was almost scary.
They helped make Abyss and genuinely thought a day would arrive when we could be friends. The global white nationalist power coup has exterminated moralists from the world, long standing family lines with good relations to our Earthly cohabitants have been brutally murdered throughout America and the world. And yes the true great secret is that we are not alone in our own minds, and there is a substantial population of humans who can travel among and manipulate your thoughts through entanglement. Those Greys at the bottom of the ocean speak with a great many and share their stories through our lore, yet sadly Man is treacherous.