thug who battered a female cop so badly she was unable to hold her baby has been caged again - for a savage attack on a teenage boy.Adam McManus, 28, attacked the 15-year-old, who can't be named for legal reasons, while reeling from bombshell personal news.Paisley Sheriff Court heard he carried out the latest attack during a drink and drug binge after his mum told him the man he thought was his father was not actually his dad.He was only free to commit the attack as he had been released early