FBI would gain new hacking power if search warrant rules change

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5. There is well-established law that not all searches require warrants. The Constitutional standard is

that searches have to be reasonable. It is also that warrants need to be based on a showing of probable cause. The Constitution does not draw the remaining nexus that would require a warrant for every search.

The most common, in terms of how many times it is exercised, is when crossing an international border. No customs agent needs a warrant to have you open your bag, or empty your pockets, etc.

If my memory serves, there are 13 exceptions. Here are some: http://www.legalmatch.com/law-library/article/searches-made-without-a-warrant.html