Read this first to see if you can be compelled to give up your password:
http://en.wikipedia.org/wiki/Key_disclosure_law
Then read this and encrypt your hard drive:
Illegal things should be used with Tor and anonymous vpn's out of the ukraine
At least in the US you can plead the 5th to avoid releasing your key. It is impossible to hack without a supercomputer accessible to only the likes of the people at the NSA. This was Casey Anthony's mistake when she killed her daughter. Remember that the police can lie to you and will do everything in their power to force you to release the key. You DO NOT HAVE TO in the USA. Pleading the 5th is not a sign of guilt and cannot be used int the court of law. WINDOWS AND MAC PASSWORDS ARE NOT ENOUGH AND CAN BE EASILY BYPASSED. Hard drive lock passwords can be reset. An encrypted hard drive is extremely difficult to hack without the key. Be internet safe, use a computer condom
"n January 2012 a federal judge in Denver ruled that a bank-fraud suspect was required to give an unencrypted copy of a laptop hard drive to prosecutors.[67][68] However, in February 2012 the Eleventh Circuit ruled otherwise - finding that requiring a defendant to produce an encrypted drive's password would violate the Constitution, becoming the first federal circuit court to rule on the issue.[69][70] In April 2013, a District Court magistrate judge in Wisconsin refused to compel a suspect to provide the encryption password to his hard drive after FBI agents had unsuccessfully spent months trying to decrypt the data " Wikipedia