Randy Gregory has admitted to failing a marijuana test at the NFL scouting combine last month . One of the most talented edge rushers in the upcoming draft , Gregory starred for Nebraska at outside linebacker for the past two seasons . ' I blame myself , ' Gregory told NFL media 's Kimberly Jones from his Atlanta home . 'And I know it sounds cliche , but there 's really no one else I can blame . ' The 22-year-old found out about the failed test a fortnight ago on the phone to his father . He had asked him to open an envelope which he mistakenly believed to be an invitation to the draft in Chicago . Randy Gregory impressed at the combine , running the 40 in 4.64 secs with a 125 inch broad jump . Gregory had 17.5 sacks in his two years at Nebraska and is one of the most coveted linebackers in the draft . Many experts have the 22-year-old as a top-five pick . At 6ft 5in he is versatile enough to rush the quarterback or operate in coverage , but in a class loaded with pass rushers , he spoke of his concerns . 'Am I worried ? Yeah , I 'm worried , ' he said . 'At the same time , I 'm confident . I know I 'm going to be all right in the end . ' Gregory told Jones that he has n't smoked marijuana since December , and that he did not use other recreational drugs . ' I do n't wake up every day saying , I 'd really love to go smoke , ' he said . 'It 's not a struggle for me every day ( now ) , it really is n't . In the past , hell yeah , it 's been a struggle . It really has been . ' Gregory 's issues with the drug were well-documented . He failed two drug tests in January and April in 2014 at Nebraska . ' I was worse at Nebraska than I 've ever been at any other time of my life . But I know how I am now . I think if teams really look at how I am now more so than the past , they 'll see I 'm making strides to get better , as a person and as a player , ' he said . Despite the red flags , 29 NFL teams spoke to Gregory at the combine and if they did not know of his off-field issues , Gregory made them aware during the interviews . Gregory will enter the NFL in the first stage of the league 's substance abuse programme . 'This incident right now is a step toward ending my career . The last thing I want to do is fail another drug test and be out of the league . '
Gregory starred for Nebraska over last year and was selected by many experts as a top five pick . Gregory , 22 , failed two drug tests at Nebraska the past two seasons 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 .