Like says a new article in http://www.consumer.es , the new tecnologies facilite us play to be privat investigator or spy.
With internet anybody can make a system of control for her home, to buy some apparatus to locate and identify people...
In internet you can buy sistems like the "werifone" or the "carchip" for control the children. But... what do you think about this??? From my point of view they are not good systems because all the people, (include children) need and must have privacy.