Personally I believe they do almost nothing. Food born illness is pretty common and almost impossible to trace unless it is a wide spread outbreak.
Many cities only inspect a food establishment every 2-3 years and in some cases as long as 5 years.
I think reputation, and economics play a larger factor in safety then government inspections. Dirty places making their customers ill tend to close long before the government inspectors come around.
There is regulation and there are consequences of not following the spirit of the regulation (most focus seems to be on compliance to the letter of the law and avoiding to do anything beyond that ignoring the spirit of the law). Consequences don't seem to be particularly deterring in much cases; the offending company pays a penalty, no executive goes to jail and people forget about it soon. Unless these executives get jail time, there won't be any fear of consequences.
Regulation works just fine when done properly, and I’d like more of it here in NZ. I’d like the supermarket monopoly broken up via regulation. I’d also like the building supplies and fuels racket broken up.
If you have any interest, check out the below link for a great piece of legislation. It protects NZ consumers and effectively puts a warranty on everything you buy here.
Another great bit of regulation is what was fine to our telecommunications industry. We have gone from a trash copper network to an excellent fibre network that is fast and inexpensive to use - all via regulation, investment and legislation.
https://www.consumerprotection.govt.nz/general-help/consumer...
Then the regulators should be asking why there are so many safety issues? Seems like by the airlines' own admission, this is a perfect ground for a full investigation and penalties in case the issues are found to be misclassified under the category of safety.