This is an interesting case that came out of the Supreme Court yesterday.
Generally, it hold that the police cannot enter a home to seize firearms without a warrant. The Cliff notes are here:
Holding: Neither the holding nor logic of Cady v. Dombrowski justifies the removal of Edward Caniglia’s firearms from his home by police officers under a “community caretaking exception” to the Fourth Amendment’s warrant requirement.
What strikes me is that it is a 9-0 opinion. Even the liberal side agrees that warrantless entries to seize firearms are unconstitutional.