Conversation so far:
What happened with the BALCO scandal and Jason Giambi?
Jason Giambi was named by FBI officers investigating BALCO as being one of the baseball players believed to have received anabolic steroids from trainer Greg Anderson
Was Jason Giambi found guilty when he was named by FBI officers investigating BALCO as being one of the baseball players believed to have received anabolic steroids from trainer Greg Anderson?
Jason Giambi admitted to using several different steroids during the off-seasons from 2001 to 2003, and injecting himself with human growth hormone during the 2003 season.
How did Jason Giambi fans react to him him admitting to using several different steroids during the off-seasons from 2001 to 2003, and injecting himself with human growth hormone during the 2003 season?

Question: What was the evidence against him?
Self-contained rewrite: What was the evidence against Jason Giambi?