Right. This rule just covers controlled substances.

I can't find a rule that covers non-sceduled drugs, either, but we have established that there's a rule requiring a DEPARTURE declaration as well as an entry declaration for controlled substances, and one of the questions was how to do that.

I think I've found a clue to how to handle the departure declaration. You go to a port of entry and ask for a Form 4457 Certificate of Registration for Personal Effects Taken Abroad. You can apparently do this in advance of your departure (i.e., not the same day) as long as the inventory on the form will match what you are taking out and taking back in. A replica of that form is here:

http://www.cbp.gov/sites/default/fil...P%20Form_0.pdf

Ironically, I found the reference to this on the CBP page about taking firearms out of the country, but as you can see from the form, it covers all "Personal effects," not just firearms. The firearm guidance is here:

https://help.cbp.gov/app/answers/det...ifle%2C-gun%2C

I don't see any reason why the controlled substance declaration shouldn't work the same way. But like I said, I'll test this theory and report back.

I also think having a 4457 in your possession certainly bolsters your case that you are following the law if you get secondaried after using Global Entry, but I intend to ask when I go in to get the 4457 how I should proceed to declare when I return with residual meds, and whether I can still use GE.