Four Louisiana Tech players suspended
Williams and Stuart are the team's top returning receivers this season. Williams had 259 yards and three touchdowns last season, though he has battled through injuries, and Stuart had 249 yards and one touchdown catch.
Molton, a transfer from LSU, was expected to contribute to the receiving corps this season after sitting out 2009 because of NCAA rules.
The Bulldogs open the 2010 season Sept. 4 against Grambling State in the Port City Classic. Kickoff is at 6 p.m. at Independence Stadium in Shreveport.
Andrea Adelson is a national college football blogger for ESPN.com. Information from The Associated Press contributed to this report.