The evidence is invalid in that it was obtained through illegal means.

此证据无效，因为它通过非法手段获得的。

youdao

He said that the police had obtained this information by illegal means.

他说警方是靠非法手段获得这一资料的。

youdao

Evidence collected by illegal means shall not be taken as the basis of penalty.

以非法手段收集的证据不得作为处罚的根据。

youdao

Monkey business usually means secret, maybe illegal,activities.

VOA: special.2011.03.13

There are just too many guns that are too easily accessible through both legal and illegal means.

ECONOMIST: America��s gun laws

But most people who try to identify leakers discover it's almost impossible unless unethical or illegal means are employed.

FORBES: Intelligent Investing Briefing Book

The ambassador said the embargo would favour the New Forces, arguing that they have always been able to obtain arms by illegal means, the BBC's James Copnall in Ivory Coast reports.

BBC: NEWS | Africa | UN arms embargo for Ivory Coast