Should I call the owner of the seedphrase careless or stupid? I guess he's both... Why would one risk the security of his funds by taking it around written on a piece of paper? I wonder if he has some coins on that because if he does, before he must had realised this video his coins must have already been moved... One lesson here don't always try to be too safe with your seed... Write it down and store somewhere safe..it shouldn't be around you all the time...
He might have made the mistake of moving around with his seed phrase but this is something anyone can do. You might write your seed phrase down in a paper and try to transfer it to a different location where you will keep it safe and then run into the police like this case. I'm not saying it was what happened, just siting the possibility of that happening. Nevertheless, I don't think I will carry my seed phrase around so the blame is on the person who was careless to allow police scan his seed phrase.