Illegal evidence refers to proofs obtained against legal procedure by legal subjects who investigate and obtain evidence.

非法证据是指法定调查取证主体，违反法律规定的程序而获得的证据。

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The guarantee of lawyers' right to investigate and obtain evidence is one of the contents of Code of Criminal Procedure of China, and it is important to promote judicial justice.

保障律师的调查取证权，促进控辩平等，更好地维护犯罪嫌疑人的合法权益，是我国刑事诉讼法的内容之一。

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However, their cases are more complicated and take longer time to investigate, obtain evidence and prepare.

但是，那些案件都比较复杂，调查取证和研究案卷的时间会比较长。

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