:If that is the case we are all in danger of having any cash we have being taken from us at any time.
In certain states here in the US... yes, be afraid, be very afraid. The local cops are taking cash from people they pull over on a regular basis using the "unknown origin" claim or "possible illegal activity". And it's damn hard to get the money back. A quick Google or two on "cops seizing money", "police seizing money" and the like should keep you busy for several hours.