I found this article regarding this:
http://blogs.riverfronttimes.com/atoz/2010/11/camp_zoe_schwagstock_seized_drugs_attorney_dea_st_louis.php
"Federal asset forfeiture law dates back to the Racketeer Influenced and Corrupt Organizations (RICO) Act of 1970, a law aimed at seizing profits earned by organized crime. In 1978 Congress broadened RICO to include drug violations. But it was the Comprehensive Crime Control Act of 1984 that made forfeiture the lucrative, widely used law enforcement tool it is today...
...According to a 1992 Cato Institute study examining the early results of the Comprehensive Crime Control Act, total federal forfeiture revenues increased by 1,500 percent between 1985 and 1991. The Justice Department's forfeiture fund (which doesn't include forfeitures from customs agents) jumped from $27 million in 1985 to $644 million in 1991; by 1996 it crossed the $1 billion line, and as of 2008 assets had increased to $3.1 billion. According to the government's own data, less than 20 percent of federal seizures involved property whose owners were ever prosecuted."