Which challenge to expert testimony appears to be the most effective?

Question

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Cross-examination is considered the most effective challenge to expert testimony as it allows the opposing party to question the expert on their methodology, knowledge, and expertise. It provides an opportunity to expose any weaknesses or biases in the expert's testimony and can help to undermine their credibility in the eyes of the decision-maker. Judicial instructions, employing an opposing expert, and identifying the qualifications of the expert are also important challenges to expert testimony, but they may not be as effective as cross-examination in terms of exposing potential flaws in the expert's testimony.

Which Challenge to Expert Testimony Appears to Be the Most