Can extradition be refused if the evidence against me is weak?

Most modern extradition frameworks do not permit courts to evaluate the strength of evidence. Under the European Arrest Warrant system, no prima facie case is required — only a valid warrant. However, some bilateral treaties, particularly older US-UK arrangements, require the requesting state to establish probable cause or a prima facie case. Even where evidential review exists, the threshold is low and courts do not weigh evidence as at trial. The appropriate forum for challenging weak evidence is the criminal trial itself in the requesting state, not the extradition hearing.