For a good overview of your rights if the police want to stop and search you, have a look at Liberty's guide here.
It's also worth reading an excellent guide published by the Home Office called "Stop and Search Explained - how police powers work in the community". And have a look at this video for a variety of views on using stop and search!
Also, have a look at Code A which governs stop and search under PACE 1984 here.
It's interesting to note that despite the extensive powers available to the police under s60 of the Criminal Justice Act 2003, the government want to extend police powers to stop and search without a reason still further for 24 hour periods where they believe serious crime is being committed.
Is this a step too far? Have a look at the above article. Do you share David Cameron's confidence that it will not damage community relations? AS students - your views please! Make a comment below.