US parents try to 'unadopt' son

From BBC News:

An American couple are reportedly trying to "unadopt" their 16-year-old son, saying the state did not tell them of his disturbing history of abuse. According to the Washington Post, Helen and James Briggs adopted the boy six years ago, after Mrs Briggs - a foster mother - fell in love with him. But in 2003 the boy, who cannot be named, sexually abused a six-year-old boy and a two-year-old girl. Mrs Briggs said it was only then that she discovered his troubled past.
The newspaper said confidential files revealed that the boy's biological parents, who were alcohol and drug addicts, had physically abused him to the extent that his brain stem was damaged - hindering his ability to gauge the passage of time. The files also suggested that he had been sexually abused. The boy had been in and out of five foster homes since he was 16 months old, in psychiatric institutions seven times and diagnosed as possibly psychotically bipolar.