On 13 April 2008 the "New York Times" published an article in which Stewart was implicated by Angel Guillermo Heredia for the use of human growth hormone. A copy of an e-mail message from July 2003 was shown to the "Times", in which Herdia described drugs he had recommended for two athletes trained by Stewart. When contacted Stewart initially denied knowing Herdia but then said that they had met after being shown a copy of the e-mail. Stewart then stated that he had rejected the drugs offered by Herdia.