Go ask Mrs. Weaver, or Randy Weaver's son, how well a lawyer can defend against an unreasonable search. There are tens of thousands of people who have had their cash or cars confiscated, never to be returned, on the false premise that it was involved in a crime. No charges placed upon the person, only the property.
But you are correct, nonetheless, about how we've allowed the federal government to run amok with property confiscations that often damage innocent persons. One of the most valuable tools in the federal prosecutors rule book is also the most potentially harmful to the law abiding citizen: RICO statutes. Suppose you're married to a felon but uninvolved and totally unaware of illegal activities. You can still lose everything to a RICO property grab.