Evidentiary hearings are legal proceedings where parties present evidence to a judge or an administrative body to determine the admissibility or credibility of that evidence. These hearings are often conducted prior to a full trial and play a crucial role in deciding issues such as motions to suppress evidence, challenges to the qualifications of expert witnesses, and the sufficiency of claims made by either party. The outcome of an evidentiary hearing can significantly influence the direction of a case, as it helps clarify what evidence will be considered in subsequent proceedings.