Reddit, what's your experience with abuse of power? (Personally)

This can mean anything from teachers, to police officers, to whoever is abusing their powers.

For me, my school tried to threaten expulsion for something I posted on facebook. They then gave me an illegal drug test (I was under 18, and a parent had not given consent), because they thought I was "on LCD and acting strange." I was in the office, answering their questions politely. A police officer gave the test, as well as an illegal body search. The school, and local authorities, refused to do anything.

So, how about all of you? I'm expecting several "Occupy Movement" examples too.