In your career as a "certified forensic computer specialist", have you have heard the terms "off-site hosting" or proxy server?
Yes I have, however neither of those are relevant. Even if the perp was hosting his porn off-site, every time he viewed it or it touched his computer, a copy of the image would wind up on his hard drive, usually in the page file. Also, all of the file names and the location from where they had been accessed would still be on his computer, regardless of where they were hosted. And using a proxy server might hide the IP address of the downloading computer from the server end, but does not affect what is stored on the host computer.
I've been working with computers and computer security for almost 20 years. I know what can and can't be done to hide your tracks, and how long it takes. Other than using strong encryption and refusing to provide the password, anything you have accessed on your computer cangenerally be located pretty quickly. The only quick solution is to physically destroy the drive. You may have prosecuted these cases, but it is clear you don't have a strong understanding of the technology behind it. That's okay, I don't have a strong understanding of the legal process used to prosecute them. We are just experts in different fields.
Thanks for destroying your own case. If the evidence is elsewhere, the already-bogus justification for pulling a Rambo-wannabee act vanishes altogether.