Free agent outfielder Marlon Byrd was suspended 50 games by Major League Baseball for testing positive for an estrogen-blocking drug, tamoxifen, which is used to minimize side effects typical in steroid use. Tamoxifen is one of 200 substances on the banned substance list and is not a performance-enhancing drug. The unsigned Byrd will remain on the restricted list for the next 50 games. He was traded by the Chicago Cubs to the Boston Red Sox in April for right-handed pitcher Michael Bowden. Byrd's 2012 season salary of $6 million is being paid mostly by the Cubs.