It is not always necessary to hire a private investigator to search for a missing person. In fact, the time consuming task of investigating a missing person can be done by almost anyone.
As long as a person understands and follows the procedure provided herein, they can do the job of searching for a missing person as well as a hired detective.
Before beginning, realize that you must maintain a detailed record of your investigation. Keep this and copies of any correspondence in a file.
Begin your investigation at the point where the subject was last seen and radiate in ever-growing circles. When you come up with a solid lead, your search will then go only in one direction.
Contact the subject's immediate family very early in your investigation. See if they have any ideas. From there you should contact your subject's closest friends and then the neighbors.
Now widen your search further by questioning other associates of the subject, like the hairdresser, bartender, gas station attendant or newspaper boy. These people must not be overlooked as they are all sources of possible information.
More than likely, when you have completed the task of speaking to all these people, you will have some good leads. But if you wish to further the investigation, use as many of the ten following sources as you need.