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A CTV investigation reveals that "the most common type of smoke alarm sold in North America - using ionization technology - is ineffective in detecting the most common type of fire that takes lives - slow, smoldering fires." The report sheds light on "several deaths in the United States when ionization smoke detectors failed to give early warning of a fire." The story finds that "the most common brands of smoke alarms sold in Canada ... will not sound at the smoke levels required by the federal government," and exposes evidence that manufacturers of smoke detectors are aware of the failings.