But he says December's incident in which a Nigerian man boarded a jet headed for Detroit with explosives hidden in his underwear shows that more work lies ahead.
VOA: standard.2010.06.05
People got more innovative with technology, using hidden devices such as pinholes and pen cameras.
Thousands of centrifuges are needed and the engineering is tricky, but the process is more easily hidden, with reasonable electrical requirements and no heat or gas that can be detected by sensors.