It's what they do with it. Storing hundreds of tons of weed plants isn't necessary if it's well documented.

http://reason.com/blog/2012/08/22/feds-destroy-1-billion-in-...

http://calcoastnews.com/2011/07/feds-raid-sanger-pot-farm-de...

Either way, you won't get it back and your investment is gone.