Could the Nottingham attacks triple killer have been stopped?

ITV News - What You Need To Know

“Justice has not been served” – that was the judgement of the families torn apart by the fatal killings in Nottingham, last June.
The triple killer, Valdo Calocane, has now been sentenced to a high-security hospital.
But for the victims’ families, their fury remains, blaming the police, CPS and NHS.
So, should Calocane have been free to roam the streets? And will the families ever get justice?
From Nottingham Crown Court, ITV News Midlands Correspondent Ben Chapman tells Lucrezia Millarini what you need to know...