There would be no need to worry on fingerprints on the flashlight or the batteries if it belonged to them. The reason it was clean was because someone did not want their presence known there. The R's were all supposed to be there so fingerprints are not an issue in the slightest.
But there would be an issue if tissue, hair or blood was found on or in the flashlight and Burkes fingerprints were clearly discernible.
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