Generate text that refutes this claim: It may be necessary to limit trial by jury in cases where it is impossible to recruit an impartial jury.  Especially in cases of nationalist conflict or terrorist attacks, it may be extremely difficult to have a non-biased jury. In Northern Island, for example, jurors may sympathize with violent offenders and acquit them despite a preponderance of evidence. Similarly, it can be a struggle to appoint non-biased juries for terrorism trials post 9/11. In 2003, the "Lackwana Six" were accused of aiding a foreign terrorist organization. The magistrate noted that "Understandably, the infamous, dastardly and tragic deeds and events of September 11, 2001 have caused a maelstrom of human emotions to ... create a human reservoir of strong emotional feelings such as fear, anxiety and hatred as well as a feeling of paranoia... These are strong emotions of a negative nature which, if not appropriately checked, cause the ability of one to properly reason to ... be blinded." Questions about jury impartiality have been raised in multiple similar cases, even leading some defendants to claim that they pled guilty out of resignation that the jury would inevitably be biased and refuse to acquit.1 The implication is that in some trials, juries may be unable to make impartial decisions, thus making the trial unfair. The only way for justice to be done, in such cases, is to allow a judge to decide the verdict.  1Laura K. Donohue, "Terrorism and Trial by Jury: The Vices and Virtues of British and American Criminal Law"
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First, there are checks in place to help prevent biased decisions and second, the less objective nature of juries is not necessarily bad. First, in most jury systems, a judge can overturn a guilty verdict if s/he believes that the jury made a faulty decision1. Judges can also order retrials in cases of guilty verdicts, if they believe there were procedural errors. Furthermore, in most countries there is a phase of the jury selection process in which both the prosecution and defence can object to a juror; in many countries each side gets a specific number of these unconditional 'peremptory challenges.' That allows blatantly biased jurors to be excluded. Perhaps most importantly, at least with juries there are multiple people making the decision, as opposed to a sole judge: there is no reason to assume that a lone judge will be less biased, just because of his 'professional training.' But second, having a subjective body making the decision is not necessarily bad. We obviously don't want people to be swayed by unchecked prejudices, but one of the points of having a jury is that it allows all parts of the community to participate in the judicial process and provide input that disconnected and often homogenous government officials cannot. For example, the Diplock courts established in 1970s Northern Ireland eliminated juries, and along with them, jury bias. This resulted in higher conviction rates for violent offenders, but also had the negative effect of excluding the Catholic minority from the administration of justice (and judge bias remained, as evidence by the failure of the courts to eliminate the gap between Catholic and Protestant conviction rates).2  1Andrew D. Stine, P.A. "Can a Judge Overturn a Jury Vedict?"  2Laura K. Donohue, "Terrorism and Trial by Jury: The Vices and Virtues of British and American Criminal Law"