"I don't think we have to be the science police in these things," he said.

“我觉得在这些事情上我们不该成为科学警察。”他说。

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In the future, fingerprint science can be used by the police and help doctors keep us in the best possible health.

在未来，指纹科学可以为警察所用，也可以帮助医生让我们尽可能地保持健康。

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But when the evidence is lacking and leads are lost, even police and forensic science can't always solve the crime.

但是，当证据不足，线索中断时，即便是警方和鉴证科学也并不总能解决罪案。

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And Delores Jones-Brown is a professor in the department of law and police science at John Jay College of Criminal Justice in New York.

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"Usually on the first hot night, people bust out, " said Walter Signorelli, a retired New York Police Department inspector who is now a professor of police science at John Jay College of Criminal Justice.

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At his trial, Mr Hoey's barrister accused two officers of lying, the police and Forensic Science Service of slapdash storage and labelling of exhibits, and explained the presence of Mr Hoey's DNA through innocent contamination, for example through exhibits taken from Hoey's home.

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