As such, would the US object if I took THC under prescription in an in-patient medical context in another country, and then attempted to enter?
And if they wouldn't object, then why would they suddenly object if I didn't get prescribed the THC, but rather purchased it over the counter, under advisement of a doctor? (After all, this is how most legal, OTC medications work. Doctors in outpatient settings don't prescribe you e.g. aspirin; they just tell you to "take two aspirin and call me if it doesn't feel better." They assume you can get your own aspirin without their help.)
>So it'd be weird if THC was an exception to that
As others in the thread have already mentioned, Desoxyn is schedule 2, while Cannabis is federally schedule 1 (with lower schedule number being more restricted).
So no, THC isn't an exception, it is a part of the same rule system. The one in which schedule 2 drugs have more legal privileges than schedule 1 drugs.
Plenty of substances are dual scheduled, desoxyn is just most prominent example.
Are you sure you're not getting it mixed up with MDMA or something?
0. https://www.justice.gov/archive/ndic/pubs5/5049/5049p.pdf
https://www.dea.gov/drug-information/drug-scheduling
(I don't agree with this, just explaining the law.)
No they're not. Desoxyn is only legal with a prescription because methamphetamine is a schedule II drug, not a schedule I drug.
There probably is some shadowy special-forces division that gets the cool stuff but I gather that even amongst the USAF's endurance fighter squadrons you won't see much stimulant use: it's too much of a liability, and the services really don't want human-liabilities piloting hundred-million-dollar supersonic death-machines.
Fun-fact: the Nazis used meth, then known as "Pervatin" - but then they also mixed it with cocaine and oxycodone and called it "D-IX" - sounds like quite the party: https://en.wikipedia.org/wiki/D-IX