At present, in the US, so long as the are bought from a company that is ONLY selling them as bulk research chems NOT for human or animal consumption, and so long as you do not encapsulate them (capsules are vehicles explicitly for the singular purpose for humans to swallow), and do not have any documents or info about human consumption, and so long as they are labeled with warnings, and are shipped with an MSDS (Material Safety Data Sheet, required for all proper chemical commerce)... they are NOT illegal. Multiple courts have ruled that INTENT FOR HUMAN CONSUMPTION is a NECESSARY element for something to be classified as an illegal drug analogue. That is very clear language in the wording of the Analogue Act.
(In operation Web Tryp, the vendors' phones and internet were tapped and they were caught having explicit discussions with customers about human consumption, dosing, effects, etc... real stupid.)