Class evidence is the category for most evidence. Class evidence is evidence associated with a group and not a single source.
Example:
general piece of something (like a paint chip)
blood (we can only generalize)
Individual evidence is evidence that can be virtually, unambiguously traced to a source.
Example:
finger prints
DNA
tool marks (under a microscope)
anything torn or broken (must be very specific)
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Class evidence is things that can be trace back to many people, such as a tire tread or shoe prints. Individual evidence can be traced back to a certain individual, such as fingerprints, lip prints, or foot prints.