The United States Congress cannot legislate technology ... but it keeps trying. A case in point is the requirement for scanning in a foreign port of all containerized cargo bound for the United States (the so-called 100% scanning requirement). It was supposed to come into effect on 1 July 2012. That date has been pushed back to at least 1 July 2014, if ever. The major reason for the delay is that no equipment capable of scanning maritime shipping containers in a practicable manner has been invented. The law, though, remains in place.