If it was my guess, I am betting it has to do with the pharmacist. They are under pressure from the DEA to monitor anyone on these kinds of meds. As everyone said your wife is on the 3 most watched. I am thinking since you don't normally use the hospital pharmacy the pharmacist felt hinky(even though you guys gave him no reason to) and called your doc.
Also they took away the least of the meds in my opinion. If the DEA were involved they wouldn't have filled it at all and if they did take away one it would have been the pain med. Again just my opinion.
This is one of the things that has been frustrating me. Why do they just not tell us the truth. Instead they come up with this cockamamie story that the DEA has red flagged you. Even waiting for my meds I have heard pharmacists and techs lie about what they have and what's allowed. I even had a doc do it with me in a pain compounded medicine with 5 ingredients and one of them being ketamine. I was told not one doc in the Rheumy practice was allowed to prescribe any schedule meds, even schedule III. They told me it was FL law.
100% Bullcrap. I researched and it was a lie. I went back and told him what I found, asked him to show me documentation where he couldn't prescribe it. Needless to say I walked out with a script for my pain crème with the ketamine.
Most of us would do better dealing with the truth. Quit wasting time with all the lies.