You buy a nice car with cash you were saving up.

Someone questions whether you could afford it.

The police accuse you of a crime.

They take your car away claiming it was bought with proceeds from the crime.

They fail to prove you committed the crime. You are found not guilty.

You do not get your car back.

In what universe is this fair?

It shouldn't be up to you to prove you saved the cash lawfully. It's up to the state to prove you didn't.