Acting on recommendations in the Mitchell Report, Major League Baseball cracked down on clubhouse security Monday in an effort to prevent the use of performance-enhancing drugs. Among the changes: teams will no longer be notified the night before drug testing personnel arrive, and all clubs must have a designated area in home and visiting clubhouses for tests to be collected. The collectors will be given permanent credentials to expedite their access. Baseball also implemented background checks and random drug tests for all clubhouse employees, and teams now will be required to log all packages sent to clubhouses at major league ballparks. Teams must give baseball's policy on "Disclosing Information Relating to the Use, Possession or Distribution of Prohibited Substances" to all employees, and the policy must be posted in the clubhouse.