Last month the Allied troops in Iraq discovered two tractor-trailers (we'd call them semi-trailers) that were allegedly capable for production of biological weapons. What did people say?

Ari Fleischer "they have been caught red handed."
Tony Blair "People are asking for proof, well we have proof"
Iraqi scientists "They are facilities for the production of hydrogen gas to fill balloons"

Guess who was telling the truth. The Observer reports "An official British investigation into two trailers found in northern Iraq has concluded they are not mobile germ warfare labs, as was claimed by Tony Blair and President George Bush, but were for the production of hydrogen to fill artillery balloons, as the Iraqis have continued to insist. "