I would like somebody to quote a reliable legal source (in any state) showing the definition of an accomplice as being anything other than somebody who actively participates in the commission of a crime. There's no question that you can easily wind up getting mistakenly arrested and charged if...
Horsefeathers.
There's no law in the US requiring you to either report a crime or to try to stop one (unless you're a teacher/doctor/caregiver suspecting child abuse, but that's a very specific exception and has nothing to do with this situation). Nor is it illegal to merely be present at a...
If you didn't steal anything and didn't deliberately do anything to help your friend steal, then you really should have refused to sign any papers and demanded that they either let you go or call the police. You're not legally considered an accomplice unless you actually assist somebody in...