If Bush and Cheney lied about WMDs in Iraq, why didn't the plant some in Iraq in all the chaos and have them discovered? They would have had to known that once the war was one their "lies" would be discovered without evidence if they were lying. So why was there no attempt to plant evidence?

Could it possibly be that the administration actually believed Saddam had stockpiles of Weapons of Mass destruction and concluded that it was better to do something to eliminate a potential threat then wait around for them to attack?