She need not have committed a crime in Canada for the Canadian gov. to take her into custody. As long as there is an international arrest warrant or the Canadians have agreements with a nation on extradition and law enforcement, they are obliged to apprehend the person.
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https://www.theglobeandmail.com/can...o-the-us-work-a-look-at-what-may-be-next-for/
Federal and state prosecutors in the United States cannot simply request that their foreign counterparts arrest and turn over an individual. Such requests must be made through the U.S. Department of Justice’s Office of International Affairs (OIA).
The OIA maintains lines of communication with authorities in other countries and is responsible for taking the next steps leading to an arrest and an extradition.
Canada is one of the more than 100 countries with which the United States has extradition treaties, obligating it to co-operate with OIA requests. These treaties vary by the offences covered and some exclude a country’s own citizens or anyone facing capital punishment.
The long-standing U.S.-Canada treaty requires the offence for which extradition is sought to be a crime in both countries.
It is not clear if OIA has formally requested Ms. Meng’s extradition.
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Last sentence: No information yet whether an OIA was issued. And the OIA agreements require the person to have committed a crime in Canada, which may not be the case here. There may have been a Red Notice issues by Interpol , but that is not confirmed.