NEW YORK — NBA players have agreed to additional drug testing, adding offseason screening for performance-enhancing drugs only.

Union executive director Billy Hunter sent a memo Wednesday, obtained by The Associated Press, to players detailing these and other changes of a new labor deal and recommended they ratify the agreement.

Less clear is a provision for human growth hormone testing.

According to the memo, an NBA-NBPA joint committee would study the “possibility of an HGH testing program.” NBA spokesman Mike Bass, however, insisted both sides agreed to HGH blood testing, subject to the process being validated by a “neutral committee.”