Ok, I worded it wrong... you got me.
You can prove a negative, if it's properly bound.... like, I can prove that, right now, there are no live adult elephants in my living room, simply by taking a few photos of the room and thus showing the absence of said elephants, at the moment proposed and within the location proposed. See? boundaries.
You can prove a negative, if it's properly bound.... like, I can prove that, right now, there are no live adult elephants in my living room, simply by taking a few photos of the room and thus showing the absence of said elephants, at the moment proposed and within the location proposed. See? boundaries.