We need to clarify smuggling and trafficking in this context. People can be smuggled into the country illegally and then they can be trafficked within this country. They can be brought in illegally as well, so we need to be aware of those two differences.
But I refer to this RCMP card, because it breaks it down into a very easy definition, how to determine if a person is being trafficked. Are they doing the work being paid for? Are they being forced or pressured to work? Do they have their papers or travel documents? Are they or their loved ones being threatened in any way, and are they free to pick up and leave at any time? This captures the essence of a trafficked person.