Electrical outlet wrapped in electrical tape

I was looking at the bathrooms in my parents home, trying to see how the outlets were set up. Even in older parts of the home, the bathrooms have GFCI outlets that I recall were installed back when they had them remodeled. I tried a GFCI/grounding tester on them, which shows up normal grounded. I suppose their contractor had access inside the walls and must have added a grounding wire to make it up to code at the time. Not sure what the contractor did, as I’d think they didn’t add a...

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