SAN FRANCISCO — A class action accusing the National Football League of prescription drug abuse is back in the national spotlight after it reportedly led federal drug agents to question team doctors over the weekend.

The Sunday inspections by the U.S. Drug Enforcement Administration, which reports say included the San Francisco 49ers, has turned the tables on the typical relationship between class action lawyers and government investigators. Civil litigation often follows federal investigations or indictments, but the reverse is more unusual.