The Department of Justice is joining Major League Baseball in searching for the source of synthetic testosterone found on San Francisco Giants All-Star outfielder Melky Cabrera, the USA Today reports.

Helping steer the investigation is Jeff Novitzky, a criminal investigator for the Food and Drug Administration who led a separate probe of anabolic steroids about a decade ago.

Some predict the investigation could lead to big headlines as stars are revealed for using performance-enhancing drugs, the USA Today reported.

Cabrera received a 50-game suspension last week after testing positive for testosterone use.

“We can’t have bodyguards on these guys 24/7, Giants manager Bruce Bochy told reporters Sunday. “It comes down to choices. Unfortunately, I do think they get bad advice from other sources.”