I had a friend of mine get his house inspected when buying, they never found (so apparently didn't plug a tester into it) multiple loose plugs, didn't note the plumbing line wrapped in an inch thick of electrical tape for a leak, and said the roof was inspected for leaks and "certified" for atleast a year but told 5 years it would need a replacement. When their kitchen ceiling started bubbling a year in I went up into the attic space and it was clear the roof had been leaking since before they bought it by the stains and mold it left on the wood. It was a complete joke of an inspection, and what makes it worse is none of that was hard to access. The attic space was accessible from the garage area with no ceiling and was easily walkable with 10 ft+ height, the loose plugs were in the living room and in plain view right when you walk in, and the taped up pipe was 15 feet into a concrete basement with a mere glance upward. Not to mention the other laundry list of items that weren't broken really but should have been noted by an inspector doing their job.
They tried to get the inspector for the obvious bullshit roof inspection but after getting ran around multiple times to the point of needing to hire lawyer to go any further. But eventually dropped it when some roofing company came by and offered to do the roof for "free" through their insurance because of supposed hail damage in the area that basically replaced half the roofs in the town. That too was probably a scam on the insurance by the roofers because we never had big enough hail for damage, but they weren't going to complain about a free new shingle job.
TL;DR Don't just grab any random inspector, and especially never take recommendations from anybody connected to real estate.