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Scott Boeck, USA TODAY Sports

Major League Baseball and the players union reached an agreement to add random, in-season human growth hormone blood testing, according several media outlets.

Testing will begin this season.

In November 2011, players agreed to HGH testing in the collective bargaining agreement. However, they were only tested during spring training and the off season.

In February, as blood testing began, several veteran players expressed concern about in-season HGH testing. "Hell no, they can't do that," Seattle Mariners catcher Miguel Olivo told USA TODAY Sports. "They took so much blood from me, I almost passed out."

Commissioner Bud Selig has made it his mission to have the strongest drug testing program of any major sport. This new agreement keeps players "in check" the entire season.

In 2011 they became the first major professional sport in North American to test for HGH.

The new agreement is expected to be announced today at the owners meetings in Arizona.