Extradition may be refused where surrender would give rise to a real risk of violations of fundamental rights under the ECHR, including where the requested person may have already effectively served the sentence underlying the request or where surrender would entail a disproportionate interference with personal liberty; issues may also arise under Article 7 ECHR where extradition relies on the retroactive application of subsequent treaty frameworks to offences arguably time-barred under the previous legal regime. Furthermore, a cassation appeal is admissible only in the presence of a manifest and serious violation of law and does not extend to a reassessment of facts or evidence.