Final answer:
A questioned-document examiner is the professional initially consulted about a possible forgery, as they specialize in verifying document authenticity.
Step-by-step explanation:
When dealing with a possible forgery, the professional most likely to be consulted initially is a questioned-document examiner. This type of forensic scientist specializes in examining documents to verify their authenticity and to identify any signs of alteration or forgery. They analyze handwriting, signatures, ink, paper, and the printing process, among other features. On the contrary, a forensic entomologist would be more concerned with biological evidence involving insects, a forensic auditor would typically deal with financial investigations, and a crime scene specialist focuses on processing the crime scene as a whole, rather than specifically looking at documents.