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It was gray and hazy , with a brisk March wind gusting up from the Alabama River as the column came over the crest of the [ Edmund Pettus Bridge [ 4 ] ] and saw a chilling sight . Their reliability are proverbial and are often used as a yardstick and a reference model for other ( new ) forensic techniques mainly to profit from their widespread image . These propositions differ from the former in being indefinite and not universal in character . Unfortunately most of these have failed , or the DNA cannot be shown to be original and authentic .