Conversation so far:
What is BALCO with Jason Giambi?
Jason Giambi was named by FBI officers investigating the Bay Area Laboratory Co-operative
What was the scandal with Jason Giambi and the Bay Area Laboratory Co-operative?
Jason Giambi was investigated as being one of the baseball players believed to have received anabolic steroids from trainer Greg Anderson.
What year was Jason Giambi investigated as being one of the baseball players believed to have received anabolic steroids from trainer Greg Anderson?
Jason Giambi  was investigated in 2003

Question: Were there other people besides him investigated?
Self-contained rewrite: Were there other people besides Jason Giambi investigated?