Quote Quoting curiousabtlaw
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Can a us felon caught in mexico with guns and drugs be prosecuted in us as well?
Can he/she be prosecuted for what? Also, what exactly do you mean when you describe this person as an "us felon"? Even if I assume you meant "U.S. felon," that could mean at least a few things.

Possession of illegal drugs/guns in a non-U.S. jurisdiction does not violate any U.S. law, but if the person is on parole or probation, it could be a parole/probation violation. And, of course, this criminal certainly could be extradited back to Mexico.