Must a Trial Judge Act as a Gatekeeper Even if Not Asked to Do So?

Here’s a question that arose during a recent class: Suppose that a party in a criminal case seeks to introduce forensic evidence from a discipline of questionable validity, such as bite mark analysis. The lawyer on the other side isn’t aware that the technique has been the subject of scientific criticism and doesn’t object. Must the trial judge nonetheless assess the reliability of the proposed testimony before admitting it?

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