. >> reporter: miyuta wants everyone to hear the message of peace and talk about it with others.believes if nobody talks, then nothing changes. nhk world, tokyo. >>> more than 2 million people in the u.s. spend their days behind bars. the annual price tag -- more than $70 billion. an increasing number of states are having difficulties covering the costs so they're coming up with ways to make prisoners pay their own way. nhk world reports. >> just want to make sure my information is correct. >> reporter: at first glance, this appears to be a typical call center. but outside the window is a barbed wire fence. everyone is wearing orange work clothes. this is a state-run prison in arizona and all of the workers are inmates. many companies have been shifting their call centers overseas where costs are low, but there are no foreign accents here as the operators are all american. >> they come to work every day, focused on the work. the work is actually fun. we could take this group of people and turn it into a sales and marketing shift. >> reporter: the state of colorado is developing i