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Lay A Foundation
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.
LA-NOLO4:DRU.1.6.5.20141111.29342