(12)In order for criminal law measures to be effective against money laundering, a conviction should be possible without it being necessary to establish precisely which criminal activity generated the property, or for there to be a prior or simultaneous conviction for that criminal activity, while taking into account all relevant circumstances and evidence. It should be possible for Member States, in line with their national legal systems, to ensure this by means other than legislation. Prosecutions for money laundering should also not be impeded by the fact that the criminal activity was committed in another Member State or in a third country, subject to the conditions set out in this Directive.