Taking a major step in his return to the Miami, former Dolphins running back has reportedly re-entered the NFL?s substance-abuse program. Williams? agent, Leigh Steinberg, reported the news to the South Florida Sun-Sentinel and has also said that the Dolphins have given Williams a copy of their offseason workout regimen. "He's confident that his weight and strength are steadily returning, that he'll be in good shape by training camp and that the process will continue throughout training camp," Steinberg was quoted by the paper. Williams abruptly retired last July, just before training camp, amid speculation of a failed drug test for marijuana. He took the year off, a move that triggered one of the worst seasons in Miami history. His return comes after a federal judge ruled in February that he had to repay the Dolphins $8.6 million in bonus money after the club claimed breach of contract.