The practitioners of this science, on the other hand, are anything but black-and-white. Although the courts have come during the 20th century to put much greater emphasis on direct evidence, human foibles still influence the manner in which forensic science is put to use. Our judgment is clouded by preconceptions concerning race and religion, and we are even subconsciously swayed by a feeling of reverence for well-known public figures.
二十世紀的法庭中，雖已增加了更多講究人、物證等直接證據的觀念，但是例如種族、宗教等人性的偏執，甚或直覺上崇敬有名氣地位的當事人，類似的觀念仍在潛意識裡，在在影響鑑識科學的運用。