How did home inspector miss THIS?

Crawl space repurposed as septic tank

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DEAR BARRY: When we purchased our home, the inspector was very thorough. At least we thought so. He spent hours looking at the house and reported a lot of defects. But later we discovered that one of the toilets was not connected to the septic system. Instead, it flushed directly onto the ground under the house. This mess was discovered by our cable man. What is the likelihood that something like this could have been missed by a home inspector? –Jesse