I have been told not to use the toilet between the airplane and immigration/customs. This will get you a free search. So put the drugs up your ass on the plane
I had a friend get strip-searched in New York coming from Amsterdam. The drug dogs picked him out. He had nothing with/on him. The agents were like "you are going down man!!!" and "they are going to like you in jail!!" he said he was scared-as-hell and they convinced him he was in trouble. When it was all over they found nothing and told him to get dressed, no apologies...