Sales was charged with multiple counts of drug possession after he and his brother, Michael, were pulled over July 29 for running a red light. Syracuse police found an open container of alcohol, several bags of marijuana, a bag of painkilling pills, and several digital scales.
Marcus Sales faced charges of fifth- and seventh-degree criminal possession of a controlled substance, second-degree criminally using drug paraphernalia, unlawful possession of marijuana and violating the city's open container law.
The charges were dropped Wednesday because a grand jury failed to find enough evidence for Marcus Sales to be charged.
Michael Sales was indicted on drug possession charges.
Marcus Sales was suspended following his arrest. Coach Doug Marrone told reporters Wednesday that there still was a university process Sales had to complete.
"It's good for Marcus to have this legal process behind him," Marrone said. "As you know, the university has a student judicial process. Until that is complete, I cannot discuss any details."
Sales had 26 catches for 414 yards and four touchdowns last season -- including three in the Pinstripe Bowl against Kansas State. He was slated to be a starting receiver this season.
Andrea Adelson covers Big East football for ESPN.com.