What qualifications make up an Expert?

Well, while I can`t define an 'expert' to the satisfaction of all, I would like to point out that in many lawsuits, the defence can usually find an 'expert' to refute the plaintiff`s 'expert.'

Hi, Ned, it`s interesting how the fame of forensic experts goes before them, so that now the 'expert' IS the evidence. We had a notorious case overturned in Australia after the famous expert from England had his evidence refuted after the case was over.Likewise the link talks of two famous FBI scientists who cribbed the evidence to sustain their record.
http://www.law-forensic.com/cfr_gen_art_17.htm
In view of the widespread use of DNA as identification, it seems the legal profession has already found a possible weakness with their approach to the prosecutor`s fallacy and the defence attorney`s fallacy.
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