All of this is beside the point that Scott is trying to make though but certainly interesting to think about. Lots of professions have intelligence floors then select for other traits over the floor level. Some professions just need as much raw brainpower as humans can provide and so select only for that. Other professions have low intelligence floors but high floors for other traits such that high intelligence people do them better all else being equal (they give IQ tests to every NFL draft prospect, for example) but the people in that profession aren’t selected specifically for intelligence.
Norplant was used internationally beginning in 1983 and was marketed in the United States and the United Kingdom in 1993. There were many complications associated with Norplant insertion and removal in the United States and it was taken off the market in 2002. Although Jadelle was approved by the FDA, it has never been marketed in the United States, but it is widely used in Africa and Asia.  Implanon was first used in Indonesia in 1998 and approved for use in the United States in 2006. Nexplanon was developed to eliminate the problem of non-insertion and localization of Implanon by changing the inserter device and making the rod radiopaque.  Nexplanon has replaced Implanon in the UK because of cases of incorrect insertion. As of January 2012, Implanon is no longer being marketed in the US, and Nexplanon is the only available single-rod implant.