Louisiana State QB Zach Mettenberger’s drug sample was diluted at the scouting combine because it was due to treatment for cramping, according to his agent, Joe Linta.

Footballguys View: An important note for his draft stock here. We should see the strong-armed rookie go off the board as a late first- or early second-round pick. Mettenberger was found to have a diluted sample, but there were ‘zero trace levels’ of illegal substances. The diluted sample could be rescinded.
NFL | Zach Mettenberger had diluted sample