Also, I would assume that even if the alleged drug dealer is found not guilty for some reason they won't get their $1M back.
I would imagine the people responsible for tracking such statistics are not motivated to flag the differences.
Today, we have it pretty good, but imagine being Italian during the hay-day of the NY Mafia busts. If civil forfeiture existed during that time, any man or woman or Italian decent could have been reasonably pulled over accused of being involved in mafia activities (gambling, prostitution, intimidation, etc) and have whatever cash they had on their persons seized.... even if they never got a conviction.
The police today are under a lot of scrutiny to not profile (though they still do it anyways), but crime rates are at record lows. What will happen if crime rates rise, and the populace becomes more willing to accept policing profiling as a preventative measure?
Your example is already done today, you just don't hear about it in those terms.
That said, the fact is that your example's archetype accounts for a vanishingly small amount of civil forfeitures.