Bud Selig revealed Saturday that he is making a push for stricter punishments in the joint drug-testing program between Major League Baseball and the players' association.

The commissioner cited recent reports of players seeking performance-enhancing substances through the Biogenesis facility in South Florida as evidence that tougher punishments are needed and Melky Cabrera's suspension towards the end of last season.

"I have been interested in stiffer penalties for some time," he said. "We've made meaningful adjustments to our testing, and it is time to make meaningful adjustments to our penalties."

Selig said there were only five positive tests of the more than 5,000 conducted last season.