testifier: Definition, Synonyms and Much More from Answers.comTes·ti·fi·er n. One who testifies; one who gives testimony, or bears witness to prove anything; a.
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供诉 = testimony

admitter or confession maker can be testifier (供诉人 ) if he is also the accused who choose to testify or provide evidence against himself in exchage for lower penalty.

but testifier is not necessarily the person who committed the act of crime.

Also, you sentence sample gives me the impression that the testifier is testifying against 汪振东.


Child Abuse & Neglect : Facts or fiction as evidence in court: a ...This charge was also tried in the 1988 trial proceedings, ... that the certainty of a testifier who made a positive identification made at a police station ...
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Sipple v. Foundation for National Progress (Part 2)The reporter is not bound by the straitjacket of the testifier's exact words .... of the most damaging ones -- are simply absent from the court proceedings. ...
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