Tyrann Mathieu is in Arizona today on a 10-team tour of pre-draft meetings as he tries to convince as many clubs as possible that he’s worthy of an investment in the draft.

The former LSU cornerback must make teams believe he’s put a lengthy history with marijuana behind him and Jarrett Bell of USA Today reports that the cornerback told one team he failed at least 10 drug tests in school.

“I quit counting at 10,” Mathieu told one team, according to an assistant coach that spoke to Bell on condition of anonymity. “I really don't know.”

Mathieu is wearing a suit and tie in his meetings with teams and he is adamant he has been clean since October since he was picked up on marijuana charges. The coach told Bell if Mathieu failed as many as 10 drug tests that LSU didn’t do enough to help the player.

NFL clubs must determine if they have the structure in place to work with Mathieu, knowing that an investment in him will be a risk. How big of a risk is the question.

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Brad Biggs covers the Bears for the Chicago Tribune