I found this...it`s old but clears up what week he has until out of the program.
Henry may end up carrying clean slate
By Bill Williamson
Denver Post Staff Writer
Article Last Updated: 03/07/2007 12:30:00 AM MST
One risk involved in the Broncos' signing of Travis Henry will be erased later this year if the running back continues to stay clean.
Henry will rotate out of the NFL's substance abuse program after the third game of the 2007 season if he doesn't have any drug violations. If he does have a violation before then, Henry would be suspended for the entire season.
Players rotate out of the program after two seasons if they don't have any further violations.
Henry was suspended four games in 2005, his first season with the Tennessee Titans, after testing positive for marijuana.