With the rapid development of electronic commerce and Internet technology, cyber crimes have become more and more common. There is a great need for automated software systems that can assist law enforcement agencies in cyber crime evidence collection. This paper describes a cyber crime evidence collection tool called DESK (digital evidence search kit), which is the product of several years of cumulative efforts of our center together with the Hong Kong Police Force and several other law enforcement agencies of the Hong Kong Special Administrative Region. We use DESK to illustrate some of the desirable features of an effective cyber crime evidence collection tool.