Political nature of the alleged crime: most nations refuse to extradite suspects of political crimes.
Possibility of certain forms of punishment: some countries refuse extradition because the person, if extradited, may receive capital punishment or torture. A few go as far as to cover all punishments that they themselves would not administer.
Bars to extradition
By enacting laws or in concluding treaties or agreements, countries decide the conditions under which they may entertain or deny extradition requests. Common bars to extradition include:
Failure to fulfill dual criminality: normally the act for which extradition is sought must constitute a crime punishable by some small penalty in both the requesting and the requested states.
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Torture, inhuman or degrading treatment or punishment: Many nations will not extradite if there is a risk that a person will be subjected to torture, inhuman or degrading treatment or punishment. In the case of Soering v United Kingdom, the European Court of Human Rights stated that it would violate Article 3 of the European Convention on Human Rights to extradite a person to America from the United Kingdom in a capital case. This was due to the harsh conditions on death row and the unclear timescale within which the sentence would be executed.