According to the text, some experienced detectives, as well as scholars of investigative procedure, believe that criminal investigation involves an element of

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The text states that some experienced detectives and scholars believe that criminal investigation involves an element of luck. This implies that despite their professionalism, determination, and good will, detectives may still rely on chance to solve a case successfully. Therefore, luck is the best choice.

According to the Text, Some Experienced Detectives, as Well as Scholars