john estein is one of them.up in a middle class neighborhood, went to catholic schools. lester holt: estein is a gulf war vet who says he was lost and broken when he came home. well, i had no direction in life. lester holt: in 2000, he was found guilty of running a massive drug ring that moved kilos of cocaine between texas and louisiana. it was his second drug conviction. my sentence was 150 years. lester holt: that's right, 150 years. he's served 20 so far. estein case is a prime example of harsh sentencing laws for both drug dealers and especially users. the legacy of the government's decades long war on drugs. more than 450,000 people in america are locked up for a drug offense. bryan stevenson says criminalizing drug addiction is misguided. we said, those people are criminals. and we didn't have to say that. we could have said that drug addiction and drug dependency is a health problem. is that why our jails are so full? absolutely. if you're looking for one explanation, this misguided war on drugs would be