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This article is about a piece of terminology in
Umineko When They Cry.
Uwtc eng

Detective's Authority (探偵権限 Tantei Kengen) is a genre convention necessary for compliance with Knox's 8th (or Van Dine's 1st.) No matter how expansive or restricted this authority is granted in the story (or by the Game Master), the detective must not be hindered in discovery of clues necessary to solution. The detective's inspection is to be considered exhaustive to the extent that it obviates any Devil's Proof; clues not yielded to the detective also eliminates any resolution those clues would have proven.

Because this was never disclosed to Battler he never knew how to take advantage of it, or when he actually was making use of it. Though Beatrice neglected to inform him, she deferred to it (inconsistently) by yielding facts of the case in Red Truths. Only when Erika arrived armed with the knowledge from Bernkastel and exploited it to its limits was Battler able to learn of it and how it functions.

It is first used after the first twilight of the End of the Golden Witch, when Erika was not initially allowed to enter the crime scene. After the Detective's Authority has been invoked, the relatives of the victims have suddenly stopped grieving and instead chose to cooperate with the outsider's investigation unconditionally. Everyone affected also goes to where she says to go and doesn't interrupt her reasoning. This is not treated as a display of magic, because Lambdadelta has retroactively altered the pieces to trust Erika unless they are being interrogated or another detective proves her reasoning lacking. Dawn of the Golden Witch also mentions that her hearing ability is greatly increased because of it, so any audible information is collected without fail.

After invoking Detective's Authority, Erika was able to simply have her personal observations rubber-stamped in Red Truth. In Dawn of the Golden Witch she refrained from invoking it, but her strategy to compensate was functionally equivalent: she could demand clarifications in Red Truth, and would be entitled to the ones that support or disprove her hypotheses. As per Knox's 8th, she would require the same clues to form deductions with.