<P> While the Health Policy Advisory Committee (HPAC) can make recommendations to the Office of the Commissioner regarding punishment, it has no power to discipline players for violations of the drug policy, except to place them in the appropriate treatment programs . Such authority belongs to the Office of the Commissioner . </P> <P> Under the policy, all players are prohibited from using, possessing, selling, facilitating the sale of, distributing, or facilitating the distribution of any Drug of Abuse, human growth hormone (HGH) and Steroid . Any and all drugs or substances listed under Schedule II of the Controlled Substances Act are considered drugs of abuse covered by the Program . Players who require prescription medication can still use it with a "Therapeutic Use Exemption" granted by the MLB . </P> <P> Prohibited Substances may be added to the list only by the unanimous vote of HPAC, provided that the addition by the federal government of a substance to Schedule I, II, or III will automatically result in that substance being added to the list . </P> <P> See List of banned substances in baseball . </P>

What method of samples are used for the majority of drug testing in major league baseball