Private detectives and investigators perform computer searches when researching a crime or conducting a background. What Private Detectives and Investigators Do Private detectives and investigators find facts and analyze information about legal, financial, and personal matters. They offer many services, including verifying people's backgrounds, tracing missing persons,investigating computer crimes, and protecting celebrities. Work Environment Private detectives and investigators work in a number of environments, depending on the case on which they are working. Some spend more time in their offices conducting Computer searches and making phone calls, while others spend more time in the field conducting interviews and performing surveillance. How to Become a Private Detective or Investigator. Private detectives and investigators usually have some college education. However, many jobs do not have formal education requirements; and private detectives and investigators learn on the job. Previous experience in investigative work can be beneficial. Private detectives and investigators need a license in most states. Mytake > we need this type of work in Tanganyika.