Final answer:
The standard of credibility being employed in this demand that Pat has the burden of proof is the highest standard of proof in criminal cases, which is evidence that is convincing beyond a reasonable doubt.
Step-by-step explanation:
The standard of credibility being employed in this demand that Pat has the burden of proof is the highest standard of proof in criminal cases, which is evidence that is convincing beyond a reasonable doubt. This means that the evidence must be convincing to the extent that there is no reasonable doubt about the guilt of the accused. It is important to note that this standard applies to criminal cases and may not necessarily apply to other situations.