I think the message is clear .... " Since the burden is on you proving your assets are lawful it makes it almost impossible to recover cash from the police. "

If I have $1000 in my pocket and people ask me where I got it, I would be in a position to tell them. { I have a job....., I have a business...., I sold a car.... }

So if they stop a person and they find $10 000 on him, and he cannot explain, where he got the money from.... it would be suspect to say the least. { Uhm.. officer, yes I am unemployed, but I have loads of cash.. I just cannot tell you where I got it}

When you walk on the right side of the law, the explanation is simple.