Lay A Foundation Definition

The act of demonstrating to a judge that a piece of evidence a litigant would like to introduce meets evidence rules requirements concerning authenticity and trustworthiness. For example, a medical report cannot be introduced unless the physician who wrote it testifies that he wrote it; and a photograph must be authenticated by the photographer or by testimony that it truly reflects a particular place or event. Even after a proper foundation is laid, however, evidence can still be excluded if, for example, it is not relevant to the point for which it is being offered.