What is considered the least reliable form of evidence?

Testimonial evidence is considered the least reliable form of evidence because it is based on personal accounts and subjective recollections of witnesses. This type of evidence can be influenced by a variety of factors, including the witness's memory, bias, emotional state, and perspective. Whereas physical evidence (like fingerprints or DNA), circumstantial evidence (which suggests a fact by implication or association), and digital evidence (such as video recordings or electronic data) can be objectively assessed and verified, testimonial evidence lacks the same level of objectivity. As a result, courts often look for corroborating evidence to support testimonials, as they can sometimes be inaccurate or misleading. This inherent unreliability makes testimonial evidence the least trustworthy when it comes to establishing facts in legal proceedings.