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After officials revealed an American family of four died in Mexico as a result of inhaling toxic gases, many are wondering if a hidden danger is lurking in their homes. Dave Hamilton, an instructor at the Morris County Public Safety Training Academy, showed Inside Edition an easy way you can test your water heater or furnace for gas leaks. “Take a match out, light it, hold it next to it, blow it out, watch the smoke,” he advises. “If the smoke gets sucked up, you’ve got a proper updraft.”