According to Sportsline:
Francisco Rodriguez, RP ANA
News: Major League Baseball confirmed Thursday morning that it is investigating if Los Angeles Angels closer Francisco Rodriguez doctored the baseball during two appearances against the Rangers this week, according to the Dallas Morning News. A Web site, The Cheater's Guide to Baseball Blog, accused Rodriguez of having a substance under the bill of his cap and using it as he closed games Monday night and Wednesday afternoon.
Analysis: Pat Courtney, a spokesman for Major League Baseball, said the office found out about the allegation Thursday and Bob Watson, in charge of discipline, is checking on it. Watson will review video of the games and could talk to umpires and players. Courtney said if evidence shows that Rodriguez did put a substance on the baseball, he could face up to a 10-game suspension. Keep K-Rod active in all leagues for now, but start thinking about a replacement option just in case this turns into a suspension.