Start at the scene of the crime According to American-trained forensics expert Li Chang-yu, there are four main elements in criminal investigations: the scene of the crime, physical evidence, information obtained through questioning, and luck.
旅美刑事鑑識專家李昌鈺曾經指出，刑事偵察的四個支柱是現場、物證、人證，還有運氣。