If you are a big vendor money laundering is important for you. Small vendors can often get away without money laundering, if you are only making a few thousand dollars a year from vending it is pretty easy to spend the money without drawing attention to yourself. However, if you are making tens of thousands of dollars a year from vending then it is important that you know how to launder your money. There are two steps to laundering money, the first is to disconnect the money from any criminal activity. This can be accomplished with Bitcoin mixes, preferably cashing out to a fake ID or with anonymous ATM cards for the ultimate separation (mixing bitcoins but then cashing out to your real ID may unlink you from a particular criminal transaction, but it is better if you are not identified as having a large amount of Bitcoin in the first place). Once you have cashed out and have cash that cannot be tied to a crimial transaction (and hopefully cannot even be associated with you at all yet), you need to be able to pay taxes on the money and account for why you have it. For many vendors a good technique is to open your own business, if you have technical skills I think that technical business are the best of all. Padding your books with drug money is a good way to clean it. Some people sell Christmas trees and pretend to have sold more than they really did, another technique I have heard of is selling fire works. If you work as a waiter you may be able to pad the amount of tips you have received, depending on how the place you work at manages tips. Pretty much any service job is your best bet, be it making websites or doing computer repair. Not only can you derive a legitimate income from such jobs, but you can also very easily pad the amount of income you have made. If you take Bitcoin or similar for the service you offer (which doesn't even look very suspicious if you offer technical services) then it makes it even easier. Simply offering services like this legitimately and padding your income with drug money is a good way to clean tens of thousands of dollars a year I think. Another technique I have heard of is pretending to have some expensive item and offering it for sale on an auction site, and then being your own highest bidder. Of course you need to take care that the high bidder cannot actually be linked to you. These techniques probably will not work for the biggest vendors who need to launder hundreds of thousands of dollars a year, but for the vendors who only need to launder tens of thousands of dollars a year I think that these techniques are sufficient. And vendors who are making only thousands of dollars a year can probably get by without actually accounting for how they got the money at all, provided they are not stupid about it. Spend the majority of your legitimate income on things like paying rent or other things that the government might be able to easily see that you did, and spend your drug money on things like groceries, preferably spend the bulk of your drug money on things that you can pay for in cash and use your legitimate money for paying for things that leave a paper trail. If you make sure to do that you can get away with having several thousand of unaccounted for dollars a year without anybody being able to tell.