Guys, I'm not supporting the law, but this decision isn't something new; it just now applies to your home. Cops have been able to do it in your vehicles for decades. They're allowed a search of your car within arms reach, which anyone knows is basically the entire cabin of a car (without going into further detailed searches of opening door panels or whatnot). All they need is probable cause. There was a case in which an officer pulled over a driver who was under the influence of narcotics. They conducted their search and came upon a pack of cigarettes. They opened the pack of cigarettes and found a large amount of drugs packed into it. At court, the defense disputed that the search was unconstitutional as it went further than legal, but was upheld in appeals as the officer had probable cause and intent.
Second, they have to have a reason to be in your home in the first place. They won't just show up and do a search without having to be there in the first place (although this could be abused I'll wager) Consider this argument: An officer is called to a domestic dispute where both mates are clearly agitated. A cursory search of the home could help the officer determine either the extent of the dispute (is there a rifle right behind that closet door?), or the degree of everyones safety.
Anyway, yeah I think it could be abused if not regulated. But, it's just not something new.