Records show 5% of the 35,877 children adopted through the subsidized program between 1993 and 2003 were voluntarily sent to foster care. The rate of return for children adopted after 2003 is less than 2% — but that number will likely climb as these children reach their teenage years and become more difficult to care for. And the percentage does not take into account the untold number of children who are simply kicked out, or sent to live with friends or relatives, instead of back to the official foster care system.