Trier of fact
In law, a trier of fact or finder of fact is a person or group who determines disputed issues of fact in a legal proceeding and how relevant they are to deciding its outcome. To determine a fact is to decide, from the evidence presented, whether something existed or some event occurred.
The factfinder differs by the type of proceeding. In a jury trial, it is the jury; in a non-jury trial, the judge is both the factfinder and the trier of law. In administrative proceedings, the factfinder may be a hearing officer or a hearing body.
Juries
In a jury trial, a jury is the trier of fact. The jury finds the facts and applies them to the relevant statute or law it is instructed by the judge to use to reach its verdict. Thus, in a jury trial, the jury makes the findings of fact while the judge makes legal rulings as to what evidence will be heard by the jury and what legal framework governs the case. Jurors are instructed to follow the law as given by the judge strictly but are in no way obligated to do so. This sometimes leads to jury nullification, where the jury's verdict differs from the law.In Anglo-American–based legal systems, a finding of fact made by the jury is not appealable unless clearly wrong to any reasonable person. This principle is enshrined in the Seventh Amendment to the United States Constitution, which provides that "no fact tried by a jury, shall be otherwise re-examined in any Court of the United States, than according to the rules of the common law".