Here is a list of all the draft picks that have been taken away from NFL teams since 1980:
2015 New England Patriots
Transgression: Deflating footballs used in the AFC Championship Game
Forfeited pick(s): 2016 first-rounder, 2017 fourth-rounder
2015 Atlanta Falcons
Transgression: Pumping artificial noise into their stadium
Forfeited pick(s): 2016 fifth-rounder
2012 New Orleans Saints
Transgression: Paying bonuses, or "bounties," for injuring opposing players
Forfeited pick(s): 2012 second-rounder, 2013 second-rounder
2011 Detroit Lions
Transgression: Tampering with safety Jarrad Page, who was under contract with the Kansas City Chiefs
Forfeited pick(s): 2011 seventh-rounder plus swap of picks with Chiefs in the fifth round
2008 San Francisco 49ers
Transgression: Tampering with linebacker Lance Briggs, who was under contract with the Chicago Bears
Forfeited pick(s): 2008 fifth-rounder plus swap of picks with Bears in third round
2008 New England Patriots
Transgression: Videotaping New York Jets coaches' signals on the sideline during a 2007 game
Forfeited pick(s): 2008 first-rounder
2002 Denver Broncos
Transgression: Circumventing the salary cap between 1996-98
Forfeited pick(s): 2005 3rd-rounder, 2002 3rd-rounder
2001 San Francisco 49ers
Transgression: Violating salary cap rules
Forfeited pick(s): 2001 5th-rounder, 2002 3rd-rounder
2001 Pittsburgh Steelers
Transgression: Exceeding the 1998 salary cap
Forfeited pick(s): 2001 third-rounder
1986 New England Patriots
Transgression: Illegal use of injured-reserve list
Forfeited pick(s): 1986 third-rounder
1981 Denver Broncos
Transgression: Contract violations involving defensive back Bill Thompson
Forfeited pick(s): 1981 third-rounder
1981 Oakland Raiders
Transgression: Illegally sequestering players in 1978
Forfeited pick(s): 1981 fifth-rounder
1980 Philadelphia Eagles
Transgression: Holding an illegal tryout
Forfeited pick(s): 1980 third-rounder
1980 Oakland Raiders
Transgression: Evasion of player limit
Forfeited pick(s): 1980 fourth-rounder
http://www.nfl.com/news/story/0ap300...ok_cfb_fenelon