On prohibitions against surveillance countermeasures: Here's a provocative distinction in "compromising emanations" (TEMPEST) from the Commerce Control List of the EAR: "List of Items Controlled 5A002.d Equipment designed or modified to suppress the compromising emanations of information-bearing signals; Note: 5A002.d does not control equipment specially designed to suppress emanations for reasons of health and safety." Wonder how much dangerous EMR the regs allow to keep the snoops happy. Reminds me of the brain-cancer-crypto NSA imposed on cellular phone intentional radiators.