Also every citizen should attmept to know their rights in this regards- tery frisk, terry stop, probable cause, reasonable doubt, legal knife size, dangerous weapons, curfews, felonious asault vs misdemeanors, etc.
http://www.amazon.com/You-Police-Boston-T-Party/dp/1888766093/ref=sr_1_1?ie=UTF8&s=books&qid=1196085266&sr=8-1 used to be a really good book about Terry frisks, searches incident to arrest, reasonable suspicion, probable cause, etc. As several reviewers mention it probably needs updated with regards to the erosion of the 4th ammendment in the post-9/11 world.
On that topic,
http://www.law.uga.edu/academics/profiles/dwilkes_more/37patriot.html, provides an excellent summary of some of the non-terrorist-activity-related 4th ammendment implications of the Patriot Act. Combine that with
(CWS note: his a$$ would have been grass if they would have found drugs, etc. Generally if they come across Item B in your house during the process of looking for item A pursuant to a search warrant, it is admissible as evidence. There is a caveat related to size of item A being sought).
and you have the perfect weapon for politically-motivated character assasinations -- just keep secretly searching until you find something you can use.
-Z