here is another thanks to the customs inspection officials at the US boarder:
Us Customs and Border Protection officers in Pharr, Texas found 3,947 pounds of marijuana which was hidden inside hollowed out limes on January 30. The drugs were found in a produce truck crossing the Texas Mexico border near the Gulf of Mexico and was found thanks to an imagining inspection system and a K-9 team.
Evidently, the K-9 dogs know the difference between marijuana and limes.