Control technologies are the 'blanket' of existing police enforcement, because, despite being almost always experienced their fallibility are sold and passed off as 'safe' and 'extremely reliable', in a game dispendiosissimo upward of technologies used for a single purpose real, ie, act as a deterrent. In this state workers for U.S. federal announce themselves within a year of testing so far perloppiù seen in science fiction films. The 'Substance Abuse and Mental Health Services Administration' is in fact planning through the SAMHSA is the use of drug testing with hair samples, saliva and sweat, much more precise, it seems, than those carried out so far with the urine in establishing time recruitment that for the type of substances taken. Out of a total of 1.6 million workers in the U.S. state are those that 200,000 each year are subjected to this type of controls, but the standards adopted here become law for another 6 million workers in large industries (Kraft. Example already I take a few). In a CBS News article it is assumed that this is a consequence of the increasingly popular falsification of the same urine test, already made ​​popular by Abbie Hoffman in his book 'Steal this urine test' at the end of the eighties. All this, even though there are already cases of 'false positives', as policemen whose hair has been exposed to substances emitted by drug use, not to mention the blatant violation of privacy, which are already mobilizing citizens' associations who defend it.