Preponderance of the evidence is balance of probabilities. E.g. if it is 51% likely that you did it, it is assumed you did it. Clear and convincing evidence means that it must be highly and substantially more probable that you are guilty in order to be assumed so. E.g. 51% would not do it.
In any case, forfeiture was done to people who were not even charged with anything, much less convinced of a crime.
In any case, forfeiture was done to people who were not even charged with anything, much less convinced of a crime.
Both are legal definitions. Convenient wiki: http://en.wikipedia.org/wiki/Legal_burden_of_proof