Below is an example of the principle of prosecuting in the UK crew committed overseas. If such a law had had a retrospective nature to allow prosecution of child rape overseas before the enactment of the law, the retrospective nature would have been unjust?
Sexual Offences Act 2003 - Wikipedia, the free encyclopedia
Sexual Offences Act 2003 - Wikipedia, the free encyclopedia
Dual criminality
Section 72 provides differing levels of dual criminality for specified offences according to the UK citizenship status of an offender. For UK nationals, acts performed outside the UK that would amount to an offence in the UK can be prosecuted as if they had been performed in the UK. Acts performed outside the United Kingdom have to constitute an offence in the country where they are committed, in order to constitute an offence under this Act.
Section 72 provides differing levels of dual criminality for specified offences according to the UK citizenship status of an offender. For UK nationals, acts performed outside the UK that would amount to an offence in the UK can be prosecuted as if they had been performed in the UK. Acts performed outside the United Kingdom have to constitute an offence in the country where they are committed, in order to constitute an offence under this Act.

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