American great Michael Johnson believes Usain Bolt can lower his 100 meters world record from 9.58 to 9.4 seconds. Johnson also claimed that a two-year ban is insufficient punishment for drug cheats.“If Usain was to be really focused and committed on cleaning up his technique he could probably run 9.4 seconds, but he would have to do some major training and adjustments in the way that he runs,” Johnson said in an interview with Laureus.com. “I think he can do whatever he wants to do. If he gets to the starting line healthy, at his best ... he wins every time ... he’s that good.” Johnson, who still holds the world and Olympic records over 400 meters, was impressed by Yohan Blake’s two victories over Bolt in last weekend’s Jamaican trials, and believes the 22-year-old is another gold-medal prospect at the London Games that start on July 27. “Yohan Blake showed he will take advantage when Bolt does not perform at his best,” the American said. “Bolt now has a legitimate challenger and will need to be at his best in London to defend his Olympic title,” he added. Johnson also called for the punishment for drug cheats to be increased from two to four years. He and his relay partners gave back their gold medals won at the 2000 Sydney Olympics following 4x400 teammate Antonio Pettigrew’s admission in 2008 that he had taken banned substances erythropoietin and human growth hormone. “You have people continuing to use performance enhancing drugs because you could be banned for two years [but] be back for the next Olympics,” Johnson said. “That’s just not enough of a punishment specifically in sports like athletics where the Olympics is really what it’s all about. The Daily Star