I have seen this sort of thing done in a number of professions, from nursing, to medicine, to law, to engineering. It is even easier if you have the same or similar name to the person you are trying to impersonate: Catherine J. Smith vs Cathy Smith. You can order copies of college transcripts and professional licenses and start your journey at that point. The problem is that there is usually no biometric identifying information associated with the transcripts or licenses, such as a picture, fingerprint or retina photo that can be used to confirm that the person named on the documents is the same as the live person in the HR office, or if there is a photo, the imposter can change their appearance to match. The HR office has done their due diligence in doing primary verification of the credentials, and the background check will not pick up anything either. I have seen this happen in the legal field more often than in medicine: you can bullshit your way through a legal job easier than a pediatric ICU job.