Possession no longer 9/10 of law

So what was it again, you’re guilty until proven innocent, right? Heard on the news today that the police have been busy kicking down doors this morning and seizing assets that people “cannot prove that they acquired legitimately”. Reminds me of the old university Roman law possessio stuff — “Whose is this lamp? Mine. How can you prove it? It’s in my room” etc. It can be pretty hard to “prove” that something is yours at all, let alone that you acquired it “legitimately”.