4th Amendment Summary by the EFF

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You can't use rights you don't know about or don't understand. The Electronic Frontier Foundation has posted a summary of your 4th amendment rights to deny the government permission to search you or your belongings (digital or otherwise).

It's good to know what you can and can't do since you should know that even when you've done nothing wrong, you may still get yourself into a lot of trouble if you are careless with your privacy.