Under the live-in caregiver program in British Columbia, live-in caregivers have to be registered with the Employment Standards Branch. If the same program were required under the SAWP, for example, or any of the temporary foreign worker programs, then the Employment Standards Branch, which is the principal enforcer of employment standards and rights, would know who those workers are and where they are, and then could target their investigations and enforcement activities.
On March 31st, 2008. See this statement in context.