Green Bay Packers cornerback Sam Shields (37) returns an interception for a touchdown as he dives past San Francisco 49ers quarterback Colin Kaepernick (7) during the first quarter of an NFC divisional playoff NFL football game in San Francisco, Saturday, Jan. 12, 2013. (AP Photo/Ben Margot)
San Francisco 49ers quarterback Colin Kaepernick (7) passes against the Arizona Cardinals during the first quarter of an NFL football game in San Francisco, Sunday, Dec. 30, 2012. (AP Photo/Tony Avelar)
San Francisco 49ers quarterback Colin Kaepernick (7) warms up before an NFL football game against the New England Patriots in Foxborough, Mass., Sunday, Dec. 16, 2012. (AP Photo/Elise Amendola)
San Francisco 49ers quarterback Colin Kaepernick (7) passes against the Chicago Bears during the second half of an NFL game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)
Nevada Wolf Pack quarterback Colin Kaepernick celebrates with fans as he leaves the field after a 34-31overtime win over Boise State during the NCAA college football game Friday night, Nov. 26, 2010, in Reno, Nev. (AP Photo/Cathleen Allison)
Nevada Wolf Pack quarterback Colin Kaepernick celebrates with fans as he leaves the field after a 34-31 overtime win over Boise State during the NCAA college football game Friday night, Nov. 26, 2010, in Reno, Nev. (AP Photo/Cathleen Allison)