It's just that the CDR could be an expert witness at his trial But is it a reliable witness? Can one be assured that this device was recording accurate data? That the sensor(s) weren't malfunctioning in some large, or even worse, small way? That the data storage element is reliably retaining the data written to it?
Actually, I see the problem the other way; reliance on a particular piece of technology simply invites someone to sell "pre-hacked" modules. Or simply disabling them so they aren't meaningful. And would Magnusson-moss act insurre that tampering with this does not affect your warranty?
Big deep questions generally arise when someone finds a solution to a non-existent problem.