On top of this, often after years of investigation, they also weigh the evidence, and decide whether to send a suspect for trial.

除此之外，往往在长时间的调查后，他们也权衡证据取舍，并决定是否将嫌疑人移送审判。

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Questions linger about how such a large number of searchers could not find the boys and why an investigation team failed to identify murder weapons despite evidence of scars on the bodies.

人们一直很不解：这么多人都参与了寻找为什么最后还是无疾而终呢，为什么调查小组还是无法确定凶器是什么即使孩子们的尸体上有着很明显的伤痕。

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Gao Chunzheng, an officer at the sub-bureau in Changping district who was in charge of a preliminary investigation on Monday, said all evidence was obtained legally.

周一，高春正，昌平区分局负责案件初步调查的警官说，一切证据都是合法获取。

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At least part of the investigation of Ms. Russell and other associates focuses on whether evidence related to the bombing investigation has been tampered with or destroyed, the officials said.

WSJ: FBI Says Boston Bombs Suggest Expertise

They should "work on the investigation, come to a conclusion based on evidence, and then either bring a case or announce their findings, " he said in an e-mail.

CNN: Prosecutor: Crime reporter's info may help Holloway case

According to the police's own legal advice, there is no case law which can be used to assist in the definition of the word "new" but they reckon it means additional evidence that would impact on the investigation of the case and which makes arrest necessary.

BBC: Police bail in the dock