One would be Todd Marinovich, a 1st round choice of the Los Angeles Raiders in 1991. He played in 8 games in the 1991 and 1992 seasons before drug use/charges cost him his career.
USC
The University of Southern California (USC) has historically placed more quarterbacks in the NFL than any other NCAA football program. Notable USC quarterbacks include Carson Palmer, Matt Leinart, and Sam Darnold, among others. This legacy of producing NFL talent at the quarterback position has solidified USC's reputation as a premier program for developing professional-level quarterbacks. Other programs, like the University of Oklahoma and the University of Florida, also have strong quarterback pipelines, but USC leads in overall numbers.
Junior Pat Haden
John David Booty
NFL Quarterback Club was created in 1994.
Todd Marinovich in 1991.
Matt Leinart
Yes
www.geocities.com/madnessmike/interesting_raider_facts.htm Hostiler
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National Football League Quarterback Challenge ended in 2007.
Yes. Although it's very rare. One recent notable example is Matt Cassel, who was taken with the 230th pick in the 7th round of the 2005 NFL Draft by the New England Patriots. He never started at quarterback once during his entire career at USC. He is currently the starting quarterback for the Kansas City Chiefs.