[vistu]

Because, in the Netherlands you can get your 'illegal' drugs tested anonymously for safety for free (or a really small fee like 2,5 euro in high traffic places like Amsterdam).

[refurb]

You can do it in the US as well. You can buy fentanyl test strips easily.

https://dancesafe.org/drug-checking/

That said, how many users actually test every single drug they purchase? Especially if they are addicted and using multiple times per day?