from a device, but it also injuries, as sort of collateral damage? >> it could be both. it could certainly be both. there may be an injurious artifact and the initial is surveillance or it's injury and some -- >> you've been advising the state department on this issue going back four years now, to 2017. you shared documents with us adopted from what we saw was unclassified information. you've i'm examined the possibility, you found electrosonic pulsing. what does that do to people? >> the ultra sonics have been known to produce a viet of effects, creating imbalance in the inner here, that can cause