inmate david scritchfield learned this lesson the hard way. >> i've been in prison 18 1/2 years now. i have been convicted of aggravated assault on police officers probably two or three times, battery on officers. you know, anything you can think of. i mean, i have stabbed officers. i've sliced officers. i've probably thrown chemical warfare on 30 people, 40 people, if not more. at one point it had gotten to where i had absolutely lost my mind. i had got out of my cell over at the north by sliding my handcuffs to the front, pulling out about a six to an eight inch knife and stabbing two different officers and chasing quite a few other ones around. i still lost. i ended up -- they actually put me in the death house. i stayed in that cell for about 30 days staring at the table. i was 20 when i came in. 19 when i fell. i came in with 18 months. >> how old are you now? >> 38. >> so all this extra time, is this all because of your behavior in prison? >> yes, every bit of it. i fought the law, and the law won. i mean, i got it in my head that i was going to battle and go against authority