More photos » by Paul Sancya - AP Detroit Lions wide receiver John Standeford catches a two-point conversion from quarterback Drew Stanton during the fourth quarter against the Indianapolis Colts, Saturday, Aug. 29, 2009 in Detroit. (AP Photo/Paul Sancya) Browse more photos » The reason teams hold mass tryouts every once in a while was exemplified today, as the Lions signed free agent cornerback Demarcus...