I am a little surprised to see that people in the medical field allow shadowing with HIPAA and privacy laws. That is one of the fields along with any kind of heavy manufacturing I thought would never allow it. I guess in the research side of medicine I could but unless the shadow can go in and watch the doctor interact with their patients it seems like a waste of time to me.
In the medical field it isn't all that difficult, the kids have to sign a confidentiality waiver and the dr asks the patient if it is ok if they have a student with them and that takes care of it.