That's when he left behind the fingerprints. "It was these fingerprints that enabled the police to crack the case. The uncanny ability of the police to solve difficult cases has led some to quip that investigators have a crystal ball in their possession. To be sure, forensic science makes the crystal ball work better, but the crystal ball itself is something else entirely--the careful reasoning of seasoned investigators.
有著神乎其技破案技術的警察常常會被形容「手上總有一顆水晶球」，科學鑑識讓水晶球更能發揮作用，但顯然，探員的細心推敲才是水晶球本身。