Crawl Space Moisture Barrier

Would it be acceptable to have the plastic stapled to the bottoms of the floor joist and not on the ground ? I see this in mobile homes, usually not in a stick built house. As you can see the ground underneath the house was not level, this may be why they did that didn’t put the plastic down on the ground.

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Thank You, Good information

Thanks for that link, very informative.

Here’s a few more.