Athletic director Dave Brandon stiffens Michigan's drug testing policies

"It became apparent to me that we had a lot of student-athletes who were looking at the testing protocol as a game of Russian roulette," Brandon told ESPN.

"As long as you weren't one of the ones that was chosen for testing in a very infrequent cycle, then you had a high likelihood to use drugs, smoke pot and not get caught because you didn't get tested."

Brandon increased the frequency of his program's testing, and stiffened the penalties for a positive test, according to the report. Michigan athletes now are suspended for 10 percent of their team's competitions for a first positive drug test and 33 percent of competitions after a second.

They receive a one-year suspension from all activities for a third positive result.

"I think it's a competitive disadvantage to have a program where there is drug usage as part of the culture," Brandon said in the report. "I don't look at it as a competitive disadvantage if we have to suspend a student-athlete from time to time to make a point."

The NCAA's most recent drug-use survey, which was conducted in 2009, showed that 22.6 percent of athletes admitted to using marijuana. That's a 1.4 percent increase over a similar study from 2005.