Section 8 Vouchers Help The Poor - But Only If Housing Is Available, Laura Sullivan, NPR, May 10, 2017, available here

The voucher was designed to be a ticket out of poverty– allowing families to use it wherever they want. With a portable voucher, families can move to places with jobs, good schools and low crime.

So far, however, the program has not always lived up to that promise, especially when it comes to women with children. Among voucher holders, a 2016 government study found fewer than 13 percent of female-headed households with children were able to move to areas with higher opportunity.