It's an open secret that the nation's housing voucher (section 8) program has its issues. And that glaringly, a program intended to give people choice often doesn't, because turns out, many landlords on the private market aren’t rushing to participate and take housing subsidies, no matter that they're backed by Uncle Sam. In St. Louis, it leads to this data point: just 7 percent of housing voucher holders live in "high opportunity areas." But very quietly over the past year, a pilot program here -- one of only a handful like it in the country -- has been trying to change that