Safety is never a bad idea, but I do know (form the Senate Analysis) that the supporters include the California Alarm Association, the California Retailers Association, Home Depot, and the State Association of Electrical Workers. At a guess of 8M households in California, to be equipped with 2 detectors each,with a low-end cost of $20 per detector (not including labor), we're looking at $320M to comply (~$345M including sales tax). The bill states there's 20 to 30 deaths per year in CA by CO poisoning. So, by these numbers, at a bare minimum, we're saving lives at a minimum cost of over $11,000,000 per life. High-end estimate is $52M per life. (These are totally unqualified estimates, but I think they're ballparkish right). I'm a natural-born optimizer. While we don't like to talk about the value of a human life, I think we can still say if we can save lives at $1,000,000 per life, it's probably a better utilization of resources than if it's costing $52M per life. Long live Smith's invisible hand. Long live personal responsibility.