I am not a lawyer, but you do not have to be a lawyer to know that the Biden administration brief in support of warrantless searches and unlawful seizures of legally held firearms is wrong and Unconstitutional.
It also comes as no surprise. Joe Biden is a devout life-long anti-gun Democrat. He has more respect for illegal immigrants than he does for legal citizens who own firearms. It will be interesting to see which SCOTUS Justices rule against the Constitution.
There are a lot of unanswered questions here though. Did the wife, as co-owner of the house, give the police permission to search and remove the guns? If not, at very least, they should not have entered and removed property without prior notice from the doctor that he was a danger to himself or others. And even that scenario is problematic, because there are anti-gun doctors who believe that anyone with a gun is a danger to society. That is always funny since there are far more people killed by medical mistakes than firearms.
