The fact is that for complex systems like the bacterial flagellum no biologist has or is anywhere close to reconstructing its history in Darwinian terms. Is Darwinian theory therefore falsified? Hardly. I have yet to witness one committed Darwinist concede that any feature of nature might even in principle provide countervailing evidence to Darwinism. In place of such a concession one is instead always treated to an admission of ignorance. Thus it's not that Darwinism has been falsified or disconfirmed, but that we simply don't know enough about the biological system in question and its historical context to determine how the Darwinian mechanism might have produced it.

"Is Intelligent Design Testable — A Response to Eugenie Scott", The Golden Spiral, 24 January 2011, retrieved on 2011-10-23