Reynolds Police Chief Lonnie Holder said he and another officer detected the odor of marijuana after pulling Marshall over at 12:45 p.m. ET Friday for a window tint violation. Holder said they found 8-10 grams of marijuana under the passenger-side visor.
Because it was less than an ounce, they didn't arrest Marshall.
The Tigers quarterback, who will be a senior this season, was cited for violations of two city ordinances. He doesn't have to appear for a Sept. 10 court date if he pays fines of $1,000 for marijuana possession and $100 for the window tint violation.
According to AL.com, the Auburn athletic department has yet to comment on the citations.
The website also reported that the school's athletic department drug policy says a student-athlete involved in an alcohol- or drug-related incident must report it "immediately" to the head coach and "failure to report the incident is itself a violation and subject to sanctions."
Marshall, who is from Pineview, Georgia, helped lead Auburn to a Southeastern Conference title and into the VIZIO BCS National Championship last season.
Information from The Associated Press was used in this report.