Some private investigation service agencies have also diversified into providing trained bodyguards and security personnel. The techniques used by private investigators in their investigations include fingerprinting, photography, voice and video recording, shadowing and the concepts of forensic science. Private investigators begin their work after being assigned the case and all relevant details. A private investigator may work alone or with teams depending on the strength of the organisation. Private investigators do not have any authority under law to detain or interrogate anyone and have to use their ingenuity in gathering proof of unethical or unlawful activities.
Any further action is up to the client.
To be a good private investigator you need lots of patience, good power of observation, an eye for detail, an analytical mind and love for adventure. Often private investigators have to work long and odd hours for days on end. Formal training in forensic sciences is not required but some knowledge of concepts is useful. For detailed forensic analysis, services of an expert can be enlisted. There is no specific educational qualification required to become a private investigator.