Evidence - Something that tends to establish or disprove a fact. Evidence can include documents, testimony, and other objects., Testimonial Evidence - What is said in court by a competent witness; also called direct evidence., Physical Evidence - Tangible items that tend to prove some material fact; also called real evidence. , Indirect Evidence - Evidence providing only a basis for inference about the disputed fact. , Circumstantial Evidence - Evidence based on suggestion rather than personal knowledge or observation. , Unknown sample - Material that has been collected from a known location but is of unknown origin. , Known sample - Material that comes from a proven or known source., Control sample - Material that is similar to the questioned and known samples, and is used to validate the test method and procedure. , Individual evidence - Material that can be related to a single source; individualization always involves a comparison. , Class evidence - Material that can be associated only with a group of items that share properties or characteristics., Crime scene - Any place where evidence may be located and gathered to help explain events. , Modus operandi - The characteristic method of operation of a criminal. , Chain of custody - A written record of all people who have had possession of an item of evidence. , Accelerant - A flammable substance used to help start a fire.,

The Crime Scene

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