Once in a newspaper, I hit upon the news that a quick witted policeman spotted a suspects spittle in the street blotted it up and ran a DNA test on it which led to the mans arrest for a murder.

我曾在一份报纸上偶尔看到这样一则新闻：一个智谋过人的警察在大街上看见一个嫌疑犯的一团唾沫后将唾沫收集起来，并对它进行DNA测试，最后推断出凶手并将之逮捕。

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