of girls, quite a number of transactions, meaning girls getting in cars. what we're watching is something that happens in big and small cities across america. and for most of this country's history it's been illegal. >> oh, that must be the pimp. >> crackdowns and criminalization have been rampant. >> all night, all day, all night. >> but there was actually a time in this country when the federal government tried something different in one american city. when commercial sex was legalized. >> if you look at what nevada does today, it's the same thing that they were doing in nashville in the 1860s. the women registered. you paid $5. and we're going to give you a license. >> i mean, could a sex worker live fairly independently? >> absolutely. >> 150 years later there's a new movement to change how sex work is viewed. and this time we're talking about something that could