[Terr_]

> So in america, if something is on my private property, it becomes mine?

No, I think the argument is the same as with a car being impounded:

1. You left shit on my property.

2. It's still yours, but I had to move it off my property.

3. The problem you created has cost me money.

4. You need to reimburse me. I'll hold onto the item for collateral.