It's worth noting that civil forfeiture doesn't just apply to cash. It can be (and has been) used against bank accounts or pretty much any property you can own. For example, here's a case where the government tried to seize $115,000 from a couple's bank accounts (without charging them with a crime): http://blogs.wsj.com/law/2015/05/08/after-seizing-couples-ba...

...but the police is less likely to go through all your immaterial belongings for just a smell of weed.