You are right about the Millenium Terror thing. The only reason they caught Ressam was because an alert customs agent thought the guy looked suspicious (he was sweating profusly) and because Ressam gave two different answers to the same question just moments apart. It was blind luck, but Clinton used it as a prime (if not THE prime) example of his administrations' commitment to anti-terrorism.
It's also true that thePort Angeles custom agent at first suspected drugs, not bombs.