"Not likely but possible."
No, very possible, even very likely. The very fact that we don't know about it, that they haven't publicly admitted the existence and regular use of these saucers, is proof of their existence and their effectiveness. Why, just last night aunt Bertha saw one of them things hovering over the local Wal-Mart. It then went to the Piggly Wiggly and some strange creature came out of the store carrying a six pack. The government knows. They just aren't telling you. Which is how you can know that they know.