He later admitted to using human growth hormone, steroids, and amphetamines.

Ellis later said that he never pitched a game without using amphetamines.

In June 2006, admitted to using amphetamines while playing in the major leagues.

Since 1970, using amphetamines without a prescription has been a federal crime.

It is impossible to know the percentage of major leaguers who were using amphetamines.

At age 24 years, 12% of the sample had used amphetamines in the past year, with 1%-2% using at least weekly.

In 1999, he was found guilty of using amphetamines and was suspended for six months.

One hundred and four percent more likely to use amphetamines.

During a conference call, Bonds declined to comment when asked if he used amphetamines.

He also said that baseball was ignoring players who used human growth hormone and amphetamines.