November 1988
Distribution and possession of anabolic steroids becomes a crime in the United States.

June 1991
Commissioner Fay Vincent issues a memo adding steroids to baseball's list of banned substances.

August 1998
Reporters spy a jar of androstenedione in Mark McGwire's locker during his chase of Roger Maris' single-season home-run record.

April 2001
Baseball institutes steroid testing for minor league players.

May 2002
In a Sports Illustrated cover story, Ken Caminiti admits he used steroids during his 1996 Most Valuable Player season.

August 2002
Baseball announces plans for anonymous "survey" testing of big leaguers.

November 2003
Baseball announces that 5 to 7 percent of major leaguers failed survey testing, triggering the creation of a mandatory testing program.

December 2003
Ten players, including Barry Bonds, testify before a federal grand jury in connection with the BALCO investigation.

November 2004
The San Francisco Chronicle obtains leaked testimony in which Jason Giambi admits using steroids and Bonds says he allowed his trainer to apply a cream that he thought was flaxseed oil.

January 2005