"There's no vacillation - I contend that all evidence is "physical evidence". To me, there simply isn't any other kind, because the physical world is all there is."
So that is like the man encased in the black box saying that there is nothing outside the box. The black box is the sum total system of all reality. But now let me come along and say, "There are certain things about our box that suggests it is not the sum total of all reality." Now, if you reply, "That is not possible, 'because the physical world is all there is'" you are begging the question. One of the very thing we are debating is whether or not the 'physical world is all there is.'
"Now, that's not to say that this will always be the case. Memories are stored in the brain (somehow), and it is highly likely that memories will one day be able to be extracted and examined by some process as yet unknown."
This is a good time to bring up one of my guiding principles. I call it the 'golden rule of epistemology.' Basically, I mean: if our assessment of what is true about reality leads us to call into doubt the means by which we derived that assessment, that assessment must be chucked; we have cut off the branch we are standing on. You are very close to violating this principle. I shall explain more if we go further in this direction. I discussed the principle more generally, here:
http://swordoftruth.us/philosophy-history-and-more/more-epistemology-sntjohnny%27s-epistemological-golden-rule/"Yes... and no. Our empirical senses are indeed the only tools we have to assess the nature of the universe, but this only gets the the deist god off the hook. The theistic version - answering prayers, performing miracles, smiting the odd heathen here and there - is eminently detectable with the faculties he was so kind to endow us with."
You are getting ahead of yourself, here. Remember we are in the black box. Now, let us think of the difference between the deist god and the theistic one. The deist one is one we infer exists, but he is still one who transcends the box. The main difference with the theistic god is that he acts within the box. But of course, given our situation- locked inside the box- and his nature- transcending the box- really the only way that we could know anything interesting about this being is if he did in fact act within the box. But that does not mean that he is IN the box with us. My fish cannot get out of the aquarium but I can reach in with my hand. The fish's limitations don't apply to me but my ability to enter the fish's system doesn't make me an aquatic entity.
You are quite wrong to think that just because the Christian God has interacted in reality that he is detectable as though he were just another fish.
"But the physical evidence is always the actual contents of the hard drive (the memory), not what you read on the screen (the words that come out of the witness's mouth)."
I know that I've just said quite a bit, but its actually this that I wanted to emphasize. However, I have to ask some more questions first to make sure we understand each other. Now, in your view, all evidence is physical evidence, and all reality is physical. So why argue that the words on the screen/out of the mouth is not physical evidence when you've just said that all there is is the physical? I don't know why you are drawing the distinction.
"...yet! The fact that I cannot access it myself does not imply that such information does not exist, or is forever unknowable."
Alright, 'yet', but what's the point? There is no way for you to currently interface directly with another human mind or even a hard drive. This sentence implies that without having a direct connection to another human mind or hard drive, the information either does not exist, is questionable, or unknowable. I am confused because, in the first place, on your view, the interface devices- such as the screen, or the mouth of the witness- are still 'physical' so what's your beef? More importantly, in the second place, it is clear that you don't automatically repudiate what you see on your screen or hear in your ears, despite the fact that you cannot 'access it yourself.' Or am I wrong, and you're waiting the hundreds and hundreds of years for humans to have the ability to access a hard drive with their mind alone or tap into another mind directly before you trust anything you see or hear?
""But the transaction is not complete until we have spent some time making sure that you as the 'computer' receiving the data is equipped with a filtering system that will interpret it fairly and correctly. Right?""
"Right."
I'm highlighting this just because it is important and we will return to it.
""There are obviously two sides to the transaction - my brain must interpret, decode and store the information that the witness gives me, but the witness's memory was also encoded and stored at the time of the event, and we know that such memories, even when recounted truthfully, are often found to be faulty.""
"But I don't think that's what's at issue here... is it?"
It certainly is, as will become apparent soon. First I'd like some clarifications about what your beliefs are, if you don't mind.