MOBILE, Ala. — Former Oakland Raiders quarterback JaMarcus Russell has been charged with possession of a controlled substance — codeine syrup — after being arrested at his home in Alabama on Monday, authorities said.

The 24-year-old former LSU star and the No. 1 draft choice in 2007 was arrested as part of an undercover narcotics investigation, said Mobile County Sheriff’s spokeswoman Lori Myles. She would not say what led to his arrest. She said he did not have a prescription for the codeine.

Russell, who graduated from high school in Mobile, was booked into the city jail and released soon afterward on $2,500 bond, online records show.