The expression 'conduct constituting any such offence' in s.42(a)(i) of the Extradition Act 1988 (Cth), as defined by s.10(2), refers to the acts and omissions by virtue of which the extradition offences were alleged to have been committed — not merely the constituent legal elements of those offences. This means that where the factual basis supporting the extradition request encompasses conduct sufficient to establish a different offence (such as a substantive offence where surrender was for conspiracy), prosecution on that different offence does not breach the speciality rule, provided the penalty is the same or lesser. The comparison required by s.42(a)(i) should not be conducted by detailed analysis of constituent elements of each offence.
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