That's a good answer 😎
Maybe what it needs is for the person to still be "innocent until proven guilty", UNLESS they have been previously convicted of drug activities (especially selling), or maybe any serious criminal convictions.
And/or finding signs of drug activities in the vehicle as well, as a "safety net", such as finding some drugs in the vehicle.
Or alternatively have the need for a local judge to decide if they (the suspects) should initially keep the money now (and that's the end of the matter), or if it needs to be proved that it was NOT criminally obtained. A bit like how a search warrant is obtained.
"Homeland security" has also resulted in the slow evaporation of our rights.