I'm watching the show Homeland Security USA on abc right now and they just showed a drug dog get fooled. It was coke that was heavily wrapped in diapers. The dog did not hit on the drugs...He got completely fooled. Upon further investigation the border patrol ripped apart the floor boards and found everything. The cops said that the diapers absorbed the smell of the drugs because naturally thats what they are designed to do. Good to try if you're really desperate.