In forensics, what is "class evidence"?

Class evidence refers to evidence that is not unique to a particular object or individual but can be linked to a group of objects or individuals that share certain characteristics. This type of evidence does not provide a definitive identification of a single source. Instead, it helps to associate items with a larger category, such as a brand of shoes or a type of fiber.

For example, if a certain type of tire tread pattern is found at a crime scene, it can be classified as class evidence because it may match multiple vehicles of the same make and model, thus linking it to a group rather than conclusively identifying a specific vehicle. This characteristic is crucial in forensics as it helps investigators narrow down suspects but does not provide the level of certainty that individual evidence does.

Class evidence can be useful in providing context and supporting other types of evidence, but it is generally considered weaker in terms of proving a specific fact related to a crime.