clean machine

Can anyone tell me if a person could expect to encounter any difficulty with US Customs if they leave the US with PGP on a lap top machine? Would you be questioned about the contents of your machine? Would you be obliged to demonstrate that the machine was "clean" before it would be permitted to leave the country? Would a person be compelled to divulge the contents of any floppy disks in their possession before leaving the country with them? Perhaps the prudent thing to do is download PGP to your machine after leaving the US. I must take a decision on this matter in a few months. Any advice would be appreciated. Cordially, rarab