I have a standard forum, currently plagued with bots. In the registration agreement, I included the following text:
SPAMBOT OWNERS, YOU HEREBY WAIVE ALL YOUR RIGHTS TO PRIVACY. ANY AND ALL INFORMATION YOU OR YOUR BOTS LEAVE, INTENTIONALLY OR ACCIDENTALLY, ON THESE FORUMS CAN AND WILL BE EXPLOITED. YOU HEREBY ALLOW US TO HACK YOUR COMPUTER(S), INTERNET CONNECTION, ETC.
While I doubt the spammers will ever go to the FBI (their IPs are all in Russia), I want to know how legal it is to hack them. After all, they did agree to it.