His law firm doesn't even have the same name as when the story was first reported. Then it was Pietrangelo and Cook. It's an OLD story ICE and TB are sending you. Biggest news anywhere, but you pretty much only get it here. What you leave behind when you die, that sort of thing.
Judicial warrants are necessary for premises entry.
Executive warrants are necessary for other tax seizures to be constitutional, but Congress hasn't even authorized the Secretary to issue executive warrants since shortly after the GM Leasing case. After all the hush, now they're finally trying to take the warrant issue down, but they're pretty much shooting blanks. The open fields exception is very narrow and probably dead. The court holds only in criminal cases is there such an exception, which is reasonable. You have to wonder why some people treat as authoritative something that doesn't even give you newspaper lead information - you couldn't find the case in the newspaper article if you wanted to because there's just not enough information.