The best thing to do is contact a local police department. Tell them that you are interested in becoming a CSI, and you want to find out more information from someone working as a CSI. Usually there are people willing to talk with you about their job, especially if you show a keen interest in their career. Don’t worry if you aren’t able to talk with a CSI right away; their days are extremely busy. It may take several days or even a couple of weeks for one to call you back, but you’ll find that they will normally talk about their job and give you valuable insights. Be sure to ask what the minimum requirements for applying in their agency are, because these requirements will vary significantly between agencies.