Unfortunately several current laws allow actions taken in secret and without any oversight, so even if it was used would anyone know?
That's precisely what makes it so scary, along with the slippery slope of loosely identifying someone as a "terrorist" or a "threat to national security." I read their criteria for deeming someone as a terrorist and it was, quite honestly, appauling.
If my memory serves me correctly, I recall you stating that you own a few handguns and rifles. By their very carelessly loose wording, that potentially could land you in prison and we'd all be none the wiser.
"Reason obeys itself; and ignorance submits to whatever is dictated to it" -- Thomas Paine