. >>> the rolling hills outside detroit are where mary chrzanowski goes to get away from it all. >> i get on that bike and i pedal, and i get in my zone. it allows me to relieve stress. >> stress that comes from her high-powered job and a reputation for striking fear in her rocourtroom. >> you want to be a tough guy? i'll let you get one punch. >> she's the iron-fisted judge known as "scary mary." >> do you remember the first time you heard the term "scary mary"? >> it was something i heard from a prisoner who said to my secretary, you work for "scary mary." >> mary chrzanowski keeps everyone on their toes. >> you're going to leave this courtroom now and get on it now. >> did you want to be known as a tough judge? >> yeah. i take the law seriously. i take my job seriously. and i wanted to be respected as being serious. >> but judge scary mary's real passion is drug court, a volunteer job that occasionally allows her to show her compassionate side. >> you're doing this without using, which is great. >> great. >> but more often has her doling out tough love like a drill sergeant. >> i w

." >> reporter: as a circuit court judge in suburban detroit, mary chrzanowski keeps everyone on theiroes. >> you're going to leave this courtroom now and get on it now. >> reporter: did you want to be known as a tough judge?tq'él >> yes. i take the law seriously. i take my job seriously. and i wanted to be respected as being serious. >> you're always going to have an addiction to drugs. >> reporter: but judge scary mary's real passion is drug court, a volunteer job that occasionally shows her compassionate side. >> but you're doing this without using, which is great. >> reporter: but more often has her doling out tough love like a drill sergeant. >> don't appease me, because i don't appease real easy. >> i want them all to think that somebody cared enough to finally slap them upside the head and say wake up. >> reporter: this innovative program gives nonviolent drug offenders a final chance to stay out of jail. addicts must pass frequent drug tests, undergo intensive counseling, and face judge mary for periodic progress reports. >> cory -- >> reporter: 23-year-old addict cory critchle