The idea
We have this legislation to deal with terrorism and it has been used to:
Remove an old man from the Labour party conference for heckling
Parents suspected of lying on their childs school application form are followed, photographed for weeks.
There have been many more cases and local govt and the police have proven themselves as not trustworthy enough to utilise the law as intended. The legislation should be redefined as to be only used in cases involving terrorism.
Why is it important?
It's extreme legislation to deal with extreme circumstances, not to be used for relatively petty issues which due to it's nature infinges on peoples freedoms and rights.