Question: The Dark Side: Secrets of the Sports Dopers was a documentary that accused the Green Bay Packers player of what position of using PEDs?

full_context: Document 1: 2005 USC Trojans football team: The 2005 USC Trojans football team represented the University of Southern California in the 2005 NCAA Division I-A football season, winning the Pacific-10 Conference (Pac-10), and playing for the NCAA Division I-A national championship. The team was coached by Pete Carroll, led on offense by quarterback and 2004 Heisman Trophy winner Matt Leinart, and played their home games in the Los Angeles Coliseum.
Document 2: 2006 All-Pacific-10 Conference football team: The 2006 All-Pacific-10 Conference football team consists of American football players chosen by various organizations for All-Pacific-10 Conference teams for the 2006 college football season. The USC Trojans and California Golden Bears won the conference, posting 7–2 conference records. USC then beat the Michigan Wolverines in the Rose Bowl 32 to 18. California running back Marshawn Lynch was voted Pac-10 Offensive Player of the Year. California cornerback Daymeion Hughes was voted Pat Tillman Pac-10 Defensive Player of the Year.
Document 3: The Dark Side: Secrets of the Sports Dopers: The Dark Side: Secrets of the Sports Dopers is a documentary episode of Al Jazeera Investigates released by Al Jazeera English and Al Jazeera America which investigated professional athletes' potential use of Performance-enhancing drugs (PEDs) naming Peyton Manning and other prominent athletes like Ryan Howard, Ryan Zimmerman, James Harrison, and Clay Matthews III.
Document 4: Clay Matthews Jr.: William Clay Matthews Jr. (born March 15, 1956) is a former American football linebacker who played for the Cleveland Browns and the Atlanta Falcons. He was the first round draft pick of the Cleveland Browns and played in 278 games over 19 NFL seasons, the 17th most appearances in league history (and most playing linebacker). Matthews had 1,561 tackles in his career, the third most in NFL history, and is trailed most closely by Junior Seau with 1,522 tackles.
Document 5: Matt Barkley: Matthew Montgomery Barkley (born September 8, 1990) is an American football quarterback who is currently a free agent. He played college football at USC, and was drafted by the Philadelphia Eagles in the fourth round of the 2013 NFL Draft. Barkley has also played for the Arizona Cardinals, Chicago Bears and San Francisco 49ers.
Document 6: Manfred Hoeppner: Dr. Manfred Hoeppner served as the German Democratic Republic's (GDR) top sports doctor. He and Manfred Ewald, who served as the GDR minister of sport (1961 to 1988) and president of his country's Olympic committee (1973-1990), are regarded as the architects of their country's state-sponsored system of using illicit performance-enhancing drugs, which is believed to explain GDR's Olympic success between 1972 through 1988. Hoeppner allegedly had ties to the East German secret police, the Stasi.
Document 7: Casey Matthews: Casey Christopher Matthews (born January 16, 1989) is an American football linebacker who is currently a free agent. He was drafted by the Philadelphia Eagles in the fourth round of the 2011 NFL Draft. He played college football at Oregon. He is the brother of Clay Matthews III.
Document 8: Matt Leinart: Matthew Stephen "Matt" Leinart (born May 11, 1983) is a former American football quarterback who now works as a studio analyst for Fox Sports’ college football coverage. He played college football at the University of Southern California (USC) from 2001 to 2005. He was the starting quarterback for the Trojans in 2003, 2004, and 2005. As junior in 2004, he won the Heisman Trophy. Leinart played professionally in the National Football League (NFL) for the Arizona Cardinals (2006–2009), Houston Texans (2010–2011), Oakland Raiders (2012), and Buffalo Bills (2013). Leinart signed a deal with the Pac-12 Network, making his official debut as a Studio Analyst on August 30, 2014. He is a recurring guest, via voicemail, on the Barstool Sports podcast Pardon My Take. Leinart will be inducted into the College Football Hall of Fame in 2017.
Document 9: Greg LeMond anti-doping stance and controversies: Considered one of the most successful cyclists of his generation, Greg LeMond competed at a time when performance-enhancing drugs were well known in his sport, including blood doping at the 1984 LA Olympics.
Document 10: Clay Matthews III: William Clay Matthews III (born May 14, 1986) is an American football outside linebacker for the Green Bay Packers of the National Football League (NFL). After attending Agoura High School in Agoura Hills, California, Matthews was a walk-on student athlete at the University of Southern California for the USC Trojans football team under head coach Pete Carroll. At USC, Matthews was a standout special teams player, winning three consecutive Special Teams Player of the Year awards from 2006 to 2008; he also played reserve outside linebacker. In these roles, he was part of three Pac-10 Championship teams.
Document 11: Greg Harden: Greg Harden is a life coach, motivational speaker and executive consultant who is best known for his work with 5-time Super Bowl champion quarterback Tom Brady, Heisman Trophy winner and Super Bowl MVP Desmond Howard, and 23-time Olympic gold medalist Michael Phelps. Brady, Howard and other athletes credit Harden with inspiring them to overcome obstacles and achieve success in their professional and personal lives. Harden has created a personal improvement program that is unique in sports. In 2014, he was profiled in a segment on 60 Minutes.
Document 12: Clay Matthews Sr.: William Clay Matthews Sr. (August 1, 1928 – March 23, 2017) was an American football offensive tackle and patriarch of a family of professional players. Matthews played for four seasons with the San Francisco 49ers of the NFL, the first in 1950. His career was interrupted by the Korean War, and Matthews became a paratrooper for the Army's 82nd Airborne Division. In 1953, he returned to the 49ers for three more seasons. He played college football at Georgia Tech and was selected in the 25th round of the 1949 NFL Draft by the Los Angeles Rams, but never played for them.
Document 13: Play Their Hearts Out: Play Their Hearts Out: A Coach, His Star Recruit, and the Youth Basketball Machine, by Pulitzer Prize winning author George Dohrmann, is an award-winning exposé of the underbelly of grassroots youth basketball in the AAU. The author follows the lives of the coach and players of an elite team, documenting the exploitation and manipulation of the children and their families by coaches seeking the best players, and the influence of shoe and sports gear companies seeking to use the sport to promote their products. Dohrmann is a senior writer with Sports Illustrated.
Document 14: Jose Canseco: José Canseco Capas Jr. (born July 2, 1964), is a Cuban-American former Major League Baseball (MLB) outfielder and designated hitter. Canseco has admitted using performance-enhancing drugs during his playing career, and in 2005 wrote a tell-all book, "", in which he claimed that the vast majority of MLB players use steroids. After retiring from Major League Baseball, he also competed in boxing and mixed martial arts.
Document 15: Pittsburgh drug trials: The Pittsburgh drug trials of 1985 were the catalyst for a Major League Baseball-related cocaine scandal. Several current and former members of the Pittsburgh Pirates – Dale Berra, Lee Lacy, Lee Mazzilli, John Milner, Dave Parker, and Rod Scurry – and other notable major league players – Willie Aikens, Vida Blue, Enos Cabell, Keith Hernandez, Jeffrey Leonard, Tim Raines, and Lonnie Smith – were called before a Pittsburgh grand jury. Their testimony led to the drug trials, which made national headlines in September 1985.
ground_truth: outside linebacker