Which of the following is NOT one of the essentials needed to prove someone is guilty of a crime?

In the context of proving guilt in a criminal case, the essentials typically include identification of the accused, evidence that a crime has been committed, and a relevant charge that links the accused to the crime.

Focusing on witness credibility, while it can certainly impact a case, it is not a necessary element to establish someone's guilt. Witnesses may provide crucial testimonies and their reliability can influence a jury's or judge’s decision, but the core elements required for conviction do not fundamentally rely on their credibility. Instead, they rely more heavily on the aforementioned aspects: establishing the identity of the accused, demonstrating that a crime occurred, and ensuring that a relevant charge has been brought against the accused.

In summary, while credible witnesses can strengthen a case, they do not constitute a formal requirement for proving guilt, which makes this aspect distinct from the fundamental components of a criminal prosecution.