Over the years, Jamaica has discovered and disqualified a number of druggies, including - a few years ago - three quarters of their women's sprint relay team. So they are not shy of doing the right thing. Maybe some slip through but I doubt whether anything institutional is going on. There are a number of Americans competing after having tested positive in the past (Gatlin for example) and a number who haven't failed tests (Jeter, for example) but who continue to be surrounded by suspicion. The list of past US athletes who were found to have taken drugs is immense. In 2008, Michael Johnson returned a 4x400m gold medal when three out of five team members were found to be druggies.
Carl Lewis is being American, preaching about things and projecting onto others the sins that, in recent years, his own people have been most guilty of.