Doesn't matter if you buy a used machine, use tails from a wireless no where near you. Smash it to bits when done and throw it and tails drive, also smashed, in the ocean @yianiris If that kind of security is necessary then GET OFF ANY DIGITAL OR OTHER FORM OF ELECTRONIC COMMUNICATION, and use trusted couriers delivering written notes, as osama did, and they found him anyway because one of his couriers didn't practice persec (saw the courier pull the phone batt to avoid tracking and tailed(sic)