A college quarterback claims a white substance on his car that tested positive for cocaine is actually bird poop.

Shai Werts, a junior at Georgia Southern, was arrested on July 31 after being pulled over for driving 80 mph and having a white powder on the hood of his Dodge Charger test positive for cocaine, according to a Saluda County Sheriff’s Office incident report. The substance tested positive for cocaine with two kits during a field test.

Werts, 21, said the substance was bird poop that he tried to clean at a car wash two days earlier and he had no idea where cocaine would’ve come from, per the incident report, which said it appeared there was an attempt to clean the substance by the windshield wipers as some of it was near the washer fluid dispenser. He was charged with misdemeanor cocaine possession and speeding. Werts was suspended from team activities after the arrest but was reinstated after passing a drug test.

“Quarterback Shai Werts returned to practice today after submitting to, and passing, a drug test. Moving forward, Shai’s case will be handled in accordance with the Georgia Southern Student-Athlete Code of Conduct,” the school’s athletic department said, according to WJCL TV in Savannah.

Though Werts is back with the team, he is still suspended for the team’s opener against LSU pending whether he’s convicted of the misdemeanor cocaine charge, according to WSAV TV. Should Werts be cleared or the charges dropped, school officials would decide whether to discipline Werts.

Whether a bird pooped cocaine on Werts’ car remains a mystery.