Caution should be exercised to select samples for testing that provide the greatest likelihood of meaningful results for a particular case. It may be necessary to consider previously collected evidence samples to determine if:

• Other relevant evidence samples exist that could be tested.
• Samples exist containing biological material that was previously undetected or not evaluated by the laboratory.
• Samples have been retained that were unsuitable for testing with previous techniques but may provide probative results with current technology.

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