Here is a portion of the drug policy addendum to the CBA that covers hGH:
In addition, in any case involving a positive test result for hGH, the
Commissionerís Office shall have the burden of establishing the presence of hGH in the Playerís blood specimen. As part of meeting that burden, the Commissionerís Office shall be required to establish the accuracy and reliability of the blood test administered to the Player. The Players Association and the Player may present any evidence in
response, and the Partiesí agreement to allow the test to be conducted shall be irrelevant to the Arbitration Panelís determination as to whether the Commissionerís Office has met that burden. The Commissionerís Office is not required to otherwise establish intent, fault, negligence, or knowing use of hGH on the Playerís part to establish a violation.