typical health clinic. it's beautiful inside. >> this is the special report gone to pot, america's marijuana obsession. good evening. the fight over pot grows, so does the use. recently washington d.c. opened the first medical marijuana dispensary, with other states that legalized it more medical uses. should it be a crime? we'll take a closer look tonight. also, dr. sanjay gupta's startling one-year investigation on pot. what he found will astound you. it's part of the his special airing tonight after our show. we'll hear from sanjay in a moment. we'll begin in california with the most intriguing group of well-healed moms that use pot and they are proud of it swearing it's perfect for raising kids. yes, you heard me. they are the pot moms of beverly hills. joining me now is cheryl shoe man who runs a beverly hills