Probably not as prevelant with the fbi...but the cops often do ask you can they search through your possessions/belongings. You have the right to say NO, which then forces/requires them to go get a warrant or whatever. There is a difference in a cop knocking on your door and saying, "do you mind if we take a look around inside?" (which is legal)... and forcing his way in and searching against your wishes (that requires a warrant)
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Probably not as prevelant with the fbi...but the cops often do ask you can they search through your possessions/belongings. You have the right to say NO, which then forces/requires them to go get a warrant or whatever. There is a difference in a cop knocking on your door and saying, "do you mind if we take a look around inside?" (which is legal) ... and forcing his way in and searching against your wishes (that requires a warrant)