Convicting the innocent

[Joanne]

The less I look, the more videos I come accross where innocent people are jailed until they're proved innocent!
I wonder how many people are in jail before being either acquitted or found guilty or is it that people get jailed to stop them absconding? Or are they too much of a threat to be free?

http://www.youtube.com/watch?v=L7rsJ9nULk0
http://www.roughjusticetv.co.uk/systemfilm.htm