Details of more than 20 of the 80 most dangerous foreign prisoners freed without facing deportation cannot be found on the national police computer. They include one murderer and a rapist. A source told the BBC police may not have sufficient details to run a check. "Well according to the Police Information Technology Organisation who provide information technology and communication systems to the police service. The Police National Computer is" : Available 24 hours all year round, the PNC is an invaluable store of information, source of intelligence and on-line aid to investigations. It holds extensive data on criminals, vehicles and property, which is accessible in a matter of seconds, through more than 10,000 terminals across the country. "That's all well and good, but its a pile of shite if you cant actually find a criminal who has served a Prison sentence!!!"