What does the law state about the legality to purchase an objectively legal good or service from a marketplace that also sells objectively illicit goods?


As far as I know, it is legal:


1. To physically browse items at a store in a bazaar that sells legal items (eg authentic Nike shoes) and also illegal items (eg counterfeit Rolex watches)
2. To [create an account and browse](https://law.stackexchange.com/questions/55096/is-it-illegal-to-make-an-account-on-darknet-marketplaces-which-provide-illega) darknet markets, which sells legal items (eg Bitcoin magazines) and also illegal items (eg Cannabis chocolate)


[Darknet markets](https://en.wikipedia.org/wiki/Darknet_market) (e-commerce websites that sell goods via anonymizing networks like [Tor](https://en.wikipedia.org/wiki/Tor_(network)#Onion_services) or [I2P](https://en.wikipedia.org/wiki/I2P)) are fairly new. The earliest darknet marketplace that I'm aware-of is the now-defunct [Silk Road](https://en.wikipedia.org/wiki/Silk_Road_(marketplace)) (2011-2013). In 2021, there are numerous marketplaces on the darknet.


Are there any legal precedents or laws that specifically address the legality of using a darknet market to purchase an objectively legal good or service?


If not, what does the law or historical precedent say about the analog of purchasing an objectively legal good/service from a physical marketplace that also sells objectively illegal goods/services?



Is it legal to purchase something from a marketplace that clearly sells illicit goods? (silkroad, darknet markets)