Lawyers for Major League Baseball have issued subpoenas to Federal Express, AT&T and T-Mobile in an attempt to gain records for its investigation of players suspected of using performance-enhancing drugs.

MLB asked Federal Express to turn over shipment records for Biogenesis, Tony Bosch, the other defendants and a long list of individuals who appeared to be affiliated with Bosch.

Bud Selig, speaking at the MLB draft Thursday night in New Jersey, declined to provide any details.

"We're in the midst of a very comprehensive investigation and it would be inappropriate for me to comment and therefore I won't," Selig said. "I'm proud of the fact we have the toughest drug-testing program, and you know what? This proves it."