What could be the most appropriate reason for a court to reject Jason's eligibility as an expert witness?

The most appropriate reason for a court to reject Jason's eligibility as an expert witness is that he was unable to furnish documents to prove that he is a computer forensic expert. Courts place significant importance on the qualification of expert witnesses, which typically includes demonstrable experience and knowledge in the relevant field. If Jason cannot provide documentation that verifies his expertise in computer forensics, it undermines his credibility and ability to provide reliable testimony. Such documentation is crucial because it helps the court assess whether he has the necessary background, education, and experience to provide informed and authoritative opinions on the subject matter in question.

While having four years of experience is valuable, the core issue here is the lack of documentation proving he is an expert in the field. The inability to detail his qualifications directly impacts his status as an expert witness, making this reason pivotal for the court's assessment.