That's really funny. They inspect between 1% - 5% of packages entering the U.S. But I think I understand President Bush's 'brilliant' idea, these Arab Muslims he's importing from the middle east to help with U.S. port security are "just doing jobs that Americans won't do".
They inspect 100% of the cargo. They physically check the percentage you state.
Port Operators aren't responsible for security in the sense of border protection nor in the sense of cargo legitimacy.
If you bemoan the fact that Customs only opens up a few boxes, I'm really confused as to why you think the nationality of a dock worker would make the situation worse... Port Operators currently inspect ZERO% of cargo.
Thats not their job.