US to Canada: just a stamp, no database record.
Canada to China: still just a stamp, but there is a record in Airline's database. Gov. has the right to check.
china to Canada: U need to fill a form, claim customs. there is quite a lot information be recorded into CA gov's database, including your pp no.
Canada to US, your passport will be slided thru a code reader.
Sooner or later, your trip will be discovered.
Canada to China: still just a stamp, but there is a record in Airline's database. Gov. has the right to check.
china to Canada: U need to fill a form, claim customs. there is quite a lot information be recorded into CA gov's database, including your pp no.
Canada to US, your passport will be slided thru a code reader.
Sooner or later, your trip will be discovered.
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