Namun setelah diumumkan ia kembali positip menggunakan hormon lelaki testosteron setelah berlomba di pertemuan atletik Kansas Relays 2006, ia kembali dihukum dan kasusnya diserahkan kepada dewan arbitrase Amerika.
But after it was announced that Gatlin had returned a positive test for the male sex hormone testosterone at the 2006 Kansas Relays he was suspended while his case was referred to arbitration.