BBC: 'I sent my adopted son back into care'

Thousands of children are successfully adopted each year, but a small number of cases will end in failure. So what makes an adoptive parent return their child into care?

Rob had been warned by social services that the boy he was adopting could be difficult, but nothing prepared him for what came next.

"He was violent towards my wife, so she got kicked and thumped," he said. 

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