Smuggler Trumps, or pro advice for BP officers:

[K.Ingraham]

In the Cold War days of the Berlin Wall, there was a little old man who crossed the checkpoint every week, pushing his bicycle and carrying a heavy sack. The border guard, suspecting him of smuggling, always searched the old man and his sack very thoroughly but never found anything worthwhile.
One day, after the wall came down, the former guard ran into the old man.
"Look, I just know you were smuggling something all those years, but I never could prove it," the guard said. "Tell me what it was."
The old man chuckled "bicycles".