>That is possible, but would require first having a security breach with access to the completed assembly to know _what traces_ first. that's not true. one ca

>That is possible, but would require first having a security breach with access to the completed assembly to know _what traces_ first. that's not true. one can design a pcb to pass conformity tests but fail in a more discrete manner, even without total knowledge of the system. This is made even more possible if the manufacture has knowledge of what conformity tests must be made, and how. This is quite often common knowledge for such manufacturers as they are trying to keep costs to the minimum required to pass the testing needed for the product to be bought by the contractor.