How should a nickname be entered when documenting an alias?

When documenting an alias in the NCIC system, a nickname should be entered as the last name with an 'X' as the first name. This method is essential because it clearly differentiates the alias from a person's legal first name while ensuring that the nickname is still associated with the individual's record. Using 'X' serves as a placeholder for the first name, which helps maintain database integrity by avoiding potential confusion that could arise if a nickname were misinterpreted as a legal name. This approach standardized the way names are recorded, making it easier for law enforcement and database users to locate records based on various identifying names or aliases.

The other methods of documenting a nickname do not conform to the established standard practices for alias reporting, which aim for clarity and consistency in records management. Thus, when following the established guidelines, the recommended approach is to utilize the 'X' to ensure proper indexing and retrieval of records.