Gregory starred for Nebraska over the past two seasons and was rated by many experts as a top five pick . burns , 22 , failed two drug tests at combine last week and failed a test at the combine last month . He says he has not smoked the drug since December and promised to retire . He did enter the NFL 's substance abuse programme .
Gregory starred for Nebraska over the past two seasons and was selected by many experts as a top five pick . Gregory , 22 , failed two drug tests at Nebraska last year and failed a test at the combine last month . He says he has not smoked the drug since December and promised to quit . He will enter the NFL 's substance abuse programme .