19-18-3.   (Rule 1003) Duplicate admissible as original--Exceptions. A duplicate is admissible to the same extent as an original unless:

             (1)      A genuine question is raised as to the authenticity of the original; or

             (2)      In the circumstances it would be unfair to admit the duplicate in lieu of the original.

Source: Supreme Court Rule 78-2, Rule 1003.

---