由Gil Grissom领导的拉斯维加斯警局犯罪鉴证科夜班组的任务是深入案发现场寻找种种蛛丝马迹，并利用最先进的科技手段，把表面上没有任何联系、没有意义的线索拼凑成不可辩驳的证据，抽丝剥茧重组案情，让犯罪分子无处可逃…… 这套剧集展现了大量前沿尖端的高科技侦破技术：弹道学、犯罪危险因子学、法医毒理学、DNA破裂鉴定、咬痕与血型分析、齿科学、痕迹学、犯罪变态心理学等，因此掀起了全球“法医学热潮。 目前，CSI.Las.Vegas共有十一季。此外，CSI.还有Miami（迈阿密）、NY（纽约）两种。
故事背景是设定在今日美国佛罗里达州的迈阿密。在北美平均每一集约有2千万个观众收看，使得它成为星期一收视第一的电视系列剧，也是最多人收看的电视系列剧。这个系列电视系列剧在全世界几十个国家都有播出，它是由亚特兰提斯同盟（Alliance Atlantis）行销至国际间。 小组成员调查神秘与不寻常的死因，以判定是谁以及如何杀了他们。成员们也会解决一些其他的重罪，例如强奸罪的采证，但这个系列电视系列剧的主题仍以谋杀案件为主。
Aired on HBO from 3 March 2002 to 2 June 2002
During the summer, Pacey and Audrey rocked Los Angeles and spent time with her next door neighbors, the Osbournes, and Jack Osbourne even tags along with them to interview at Worthington. Jen spent her time in New York and got ecstatic to learn her parents are separating. Jack got dumped by Eric, but got over it. Joey spent her summer in Capeside doing a lot of reading, working and romancing. On their first week back at Boston Bay College, Jen is shocked to run into find that Grams Ryan has decided to go back to school. At Worthington, Joey experiences nothing but bad luck when she decides to enroll in an intermediate writing class taught by the liberal, but manipulative and cynical, Professor Greg Heston who does not hesitate to ridicule and embarrass Joey in front of the class with her lack of knowledge of the current book topic. Pacey and Jack move out of Grams' house and Pacey tries to get the perfect apartment, owned by a feisty, punk rock British woman, named Emma Jones, who works as a waitress in the local bar Hell's Kitchen. Also, Dawson is working on a new movie, a horror film titled "Wicked Dead" with him as the assistant director and the hack Todd Carr as director. When he finally gets together with Joey, he is the only one to have remembered her 20th birthday.
