If no solution, you need evidence. 

Then I would follow through if it happens again.If the neighbor smells it, that's all the evidence I need.

What igets me is tenants for a week or more didn't say anything about a leak that was evidently coming from the ceiling and dripping down the walls.They are students who continue to stay after there lease, so are now month to month.

If you don’t actually reside on the property, evidence of preparation for occupancy is needed.

The tenant call yell all he wants - as long as you have the photo and/or video evidence of move-in and move-out condition there's not much he can do. 

Um, where did the "price" come from and you still have no evidence that you are not over paying.

You will typically (but not always) get a formal hearing, but you don't have to physically go as long as you have your ducks in a row (i.e. have compelling evidence provided to them in advance making your case for the valuation dispute).

Sounds like you got an awesome deal on the program, evidently they are not offering anything like that any more haha.

In the county records I don't see any evidence that the county sent notices to anyone outside of the former owner.

Then, when you DO catch them, or find actual evidence of a particular violation, follow through with the consequences in a formal, businesslike manner by giving written notice with deadlines as allowed by local law.