Final answer:
Dr. Bruce Ivins, a scientist at the U.S. government's Fort Detrick lab, was the main suspect in the 2001 anthrax attacks.
Step-by-step explanation:
The main suspect in the 2001 anthrax attacks, also known as the anthrax scandal, was Dr. Bruce Ivins. He was a scientist who worked at the U.S. government's biodefense labs at Fort Detrick in Frederick, Maryland. Ivins was under investigation and was about to be charged when he took his own life in 2008. The investigation into the anthrax letters reveals that the spores were prepared with a high level of expertise in microbiology, indicating that the perpetrator had specialized knowledge in handling hazardous biological materials.