But what if a prosecutor concludes that there is both probable cause and a reasonable doubt?

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It must have a reasonable belief that a crime has been committed and evidence of probable cause that records or other evidence of the crime will be found at the location desired to be searched.

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The Home Office's extradition review, led by former Court of Appeal judge Sir Scott Baker, argued there was no real difference between the US tests of "probable cause" and the introduction of "reasonable suspicion".

BBC: US-UK extradition: The law explained