SCOTUS gets things wrong all the time; regardless, this incident clearly doesn't fall under any made-up, extra-constitutional "exigent circumstances" exception to 4A. And further: they did have the search warrant, so "exigent circumstances" wouldn't apply, anyway. They had this guy on buying and selling firearms for profit without having an FFL. It's a procedure crime, not a violent crime. Show up to his house in broad daylight, without the SWAT team.The Supreme Court has recognized several exceptions to the warrant requirement rule, including immediate loss of evidence under the exigent circumstances rule. Not saying that this fits this particular situation, I don't feel that it does. But that rule is a thing.