Zach Mettenberger produced a diluted urine sample at the NFL scouting combine in February, leading to speculation that the former LSU quarterback had a drug issue. Not so says his trainer, who said that the diluted sample was the result of over-hydration. Following an ACL tear during his final game at LSU, Mettenberger spent most of the winter leading up to his pro day in April at the TEST Parisi Football Academy in Martinsville, N.J. working with club owner Kevin Dunn. Dunn oversaw a rehab for Mettenberger that went six days a week and saw the player at the facility from dawn till dusk. And while a diluted sample is considered a failed test by the NFL, Dunn explained what happened. “His surgery left him with two-thirds of a hamstring tendon; one-third was used to replace his ACL. Due to this rigorous protocol where he arrived at 7:30 A.M. and trained until 5:30 P.M, his hamstring began cramping,” Dunn said. “We then elevated his water intake to between one to one-and-a-half gallons of water per day in accordance with guidelines from the ACMS, NSCA, ACE & NATA - all of which are considered gold standard resources for our industry. We also increased his potassium and sodium intake to combat the cramping, which was successful.” The failed test has led to speculation that there is a drug issue with regards to Mettenberger, something Dunn says is not true.