Madam Chair, as with any criminal offence, the police have the power to investigate a possible impaired driving offence at someone's home. However, the police, as they did before this legislation existed, have to form reasonable grounds to believe that the driver has committed the impaired driving offence before they can demand a breath sample. If the driver had no reasonable expectation of being asked to provide a sample and their blood alcohol concentration was consistent with not being over the legal limit, they would not be convicted under the new law.
In the House of Commons on May 14th, 2019. See this statement in context.