international crime
Is commiting a domestic crime in a foreign country punishable?
<p>If a Frenchman was to commit a French crime while visiting Australia, where that action is not a crime, can France prosecute them for that action?</p>

<p>That depends on the details of the French law involved. If the French law says that it applies outside of French jurisdiction, that it may.</p>
<p>There are, I know, US laws that specifically apply tom actions by US people that occur outside the US. For example the <a href="https://www.justice.gov/criminal-fraud/foreign-corrupt-practices-act" rel="nofollow noreferrer">The Foreign Corrupt Practices Act (FCPA)</a> at 15 U.S.C. §§ 78dd-1, et seq. makes it a crime to pay bribes and make improper payments outside the US. The US does prosecute its citizens on charges of violating the FCPA. There could be a similar law in France.</p>
