Final answer:
If lay witnesses authenticate a handwritten document, the opposing side can still call a forensic document examiner to establish that the document is a forgery.
Step-by-step explanation:
The statement in the question is False. If lay witnesses authenticate a handwritten document, it does not prevent the opposing side from calling a forensic document examiner to establish that the document is a forgery. Both lay witnesses and forensic document examiners can provide evidence in court, but their roles and credibility may be evaluated differently.