Primary Sources are the original records of an event, study, or time period. Primary Sources found on criminals vary depending on jurisdiction of the crime, the date of the crime and privacy laws. Generally, if the criminal or victim is living, it will be more difficult to find primary sources about the crime.
Put the person's name in quotes and then follow it with the type of type of source you are interested in.
For example: “ted bundy” archives.
Add site:.gov as part of your search string to search only government web sites.
For example: "Ted Bundy" letters site:.gov.
In some cases, the criminal's nickname may have been more widely known than the criminal's actual name.
For example: "Green River Killer".