I am seldom without some sort of pocketknife unless showering, and have never been hassled. I carry Spyderco knives with the pocketclip in my right front pocket, and a Wave in the leather sheath on my right hip. At work, a Squirt P4 in my fanny pack, because scrubs don't have too many pockets! I set off metal detectors in the hospitals, but security/police are more interested in visitors than the staff. I make a point to keep a stethescope visible in my vehicle, and usually have a hospital ID with me. Police tend to cut a little slack to medical workers, hoping that they don't need our services someday.
I used to wear EMS style pants when transporting patients between hospitals, and I carried enough knives and multitools to give the TSA folks a heart attack!