Former Michigan safety Jabrill Peppers tested positive for a diluted substance earlier this year at the NFL Combine, sources have confirmed to ESPN's Adam Schefter:

NFL notified teams that Michigan’s Jabril Peppers tested positive for a dilute sample at the combine, league sources tell ESPN. — Adam Schefter (@AdamSchefter) April 24, 2017

From Schefter's personal Facebook page:

According to a CAA spokesman, who works for agency that represents Jabril Peppers: "Peppers went to the combine. He was sick after flying there from San Diego. He has a history of cramping. Peppers was being pumped with fluids, drinking 8-10 bottles of water before he went to bed, because he was the first guy to work out two days for the LBs and DBs. He had to go through that first day, come back on second day, and that was the fear. So Peppers was pounding water and under the weather. He never failed a drug test in his life, nor tested positive before for any substance."

The two-time All-American is one of the most versatile players in the draft and could play a variety of positions at the next level, but most scouts see him at the back end.

"What Peppers lacks in size he makes up for with ferocity and speed," writes CBS Sports NFL analyst Rob Rang. "Michigan featured him on offense, defense and special teams and his NFL team would be wise to do the same as Peppers is a natural playmaker capable of starring in any number of roles, depending on the down, distance and creativity of his coaches."

Peppers joins fellow projected first-round pick Reuben Foster, who also failed a drug test at the combine due to a diluted substance.