From the press release:

The Office of the Commissioner of Baseball announced today that New York Yankees minor league player Hector Noesi has been suspended for 50 games, effective at the start of the 2007 season, for testing positive for a performance-enhancing substance in violation of the Minor League Drug Prevention and Treatment Program.

Noesi, a 19 year old RHP, was 0-0 with an ERA of 1.29 in 5 games for the GCL Yankees this year.