Given the task definition and input, reply with output. In this task, you will be shown an extract from a movie plot and a question. You need to provide the correct answer for it. Short answers containing words that are present in the passage are preferred.

a/k/a Tommy Chong is a film depicting Tommy Chong of Cheech and Chong and his legal problems with The Department of Justice. Filmmaker Josh Gilbert follows the tale of Chong as he becomes a target in a government sting, code named "Operation Pipe Dreams". Tommy Chong was the only defendant without a prior conviction to receive a jail sentence. The federal government stated that the reason that it sought this harsh punishment was because of the comedy movie Up In Smoke trivialized the government's anti-drug efforts.The documentary discloses that Tommy Chong's son, who actually ran the company which sold the paraphernalia was never charged or indicted by the Federal government. In May 2008 federal agents raided the owner of the distribution rights to this DVD.The documentary is critical of the prosecution of Chong by the U.S. federal government led by the U.S. attorney for western Pennsylvania, Mary Beth Buchanan., Question: What is the profession of Mary Beth Buchanan?
Answer: U.S. attorney