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Yes, the risk is with every power supply connected to AC outlet, however in vast majority of cases we are isolated from wires by device plastic case. It is quite different with medical devices connected to human body. There are strict requirements on galvanic isolation and usually medical devices use old style transformers in PSUs. Also, there are optocouplers on USB lines and so on, some related documentation can be found here https://www.edn.com/design/medical/4314949/Designing-medical-devices-for-isolation-and-safetyAdding a note about GFCI is great, it is a must, not sure if it sufficient though. You may also consider battery powered solution to avoid AC altogether.