America has the highest incarceration rate in the world, and that opens up the door for companies to have a captive market -- literally. One of those companies is JPay, which provides electronic money transfers and other services to about 70 percent of state prisons. But in order to get that lucrative state prison contract, the state takes a commission as well. Critics argue all the costs are passed down to families and inmates, often burdening them financially. CNBC's Dina Gusovsky Reports.