According The New York Times Major League Baseball is planning to implement blood testing for human growth hormone in the Minor Leagues later this year. An official in baseball with direct knowledge of the matter told the newspaper. More here: http://mlb.mlb.com/news/article.jsp?ymd=20100224&content_id=8128628&vkey=news_mlb&fext=.jsp&c_id=mlb and here: http://www.nytimes.com/2010/02/24/sports/baseball/24hgh.html?sudsredirect=true