- 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.
- 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.