2). Snap some candid photos of them in public
3). Threaten to make a myspace profile in their name unless the pay up
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Putting cameras in their homes might be better than sending them to jail.
In the US, we have a nice little thing called due process, which guarantees (or at least it used to) that, before a person could be deprived of their rights in such a way as having a camera installed in their home, they are entitled to a fair and impartial trial by a jury of their peers.
"Love your country but never trust its government." -- from a hand-painted road sign in central Pennsylvania