Erowid - Documenting the Complex Relationship Between Humans and Psychoactives

I'm curious how people go about finding safe sources for something like LSD (to be clear I'm not asking for anyone to give specific details, just an explanation). While psilocybin is easy to try safely (just travel to a place where it is legal), LSD is illegal in every jurisdiction as far as I know. The thought of ingesting some substance from dubious sources, that could be contaminated with absolutely anything, terrifies me and I honestly don't know how people bring themselves to take this kind of risk. Am I missing the point and there is some safe underground supply chain for this sort of thing?

- Buy on the darkweb. Marketplaces exist with established vendors, open forums, feedback, customer support, escrow... I could write a long text about how this is an infinitely better way to do things for all concerned than to "force" non-violent people to interact with violent drug traders and adulterated products, but let's leave that for now. You can pay with Monero for untraceability.

- Test what you get. Some stuff being sold as LSD might actually be another synthetic psychedelic, potentially dangerous (unlike LSD). So test: even in jurisdictions in which LSD is banned, you can easily buy tests; for LSD, this would be Erhrlich's reagent. If it tests positive, and since there's no reason to have LSD and an adulterant (unlike other drugs such as cocaine), you're safe.

Of course, this is what my friend told me.

Interesting. Can you clarify this part?

> there's no reason to have LSD and an adulterant

Why is that? From what I understand LSD is pretty challenging to produce, so isn't there an advantage to an unscrupulous producer using something easier/cheaper?