Wel at least in England they are taken to court and now some are being vindicated with financial compensation. In America, the photographer is usually threatened, taken in for hours of interrogations and then released with warnings of "Don't take any more pictures!" and threats of being put on watch lists.
The link to the news article about England is here: http://www.amateurphotographer.co.uk/photo-news/538834/amateur-photographer-wins-10-000-police-payout
Don't know how much 10,000 pounds is but I am sure it is a princely sum.
An associated case link is here: http://www.amateurphotographer.co.uk/photo-news/534399/amateur-photographer-wins-police-payout-update-5-05pm
For a downloadable copy of a abstract by Morgan Manning dealing with these issues go here:
And of course there is my original post back in in Jan 31 2011 at http://www.hldphotos.blogspot.com/2011/01/photographers-rights.html