What kind of training do you need to be a detective?

In most departments you have to start out as a patrol officer and stay in that position a few years so you can learn how to deal with people and crime scenes. When you have proven yourself to the department that is when you typically can advance to an investigator position. There are many classes that you may take such as interrogation techniques, computer crime investigations, etc. It is up to the department usually to determine what classes they will pay for and want you to take. An organization called the NWCC (National White Collar Crime) division offers free classes to departments nationwide on computer crime for example. In the end, just be a good patrol officer and learn street smarts and with some good work ethics and an education, you can strive to be a detective.