When I was in Singapore years ago, I visited the wet markets. At first, I didn't know what to expect. I had only heard of these places, so I kind of kept an open-mind, but even when I did that I still had in my mind what I could expect. I don't know if they have any food or health inspectors, but if I had to guess, I would say no.
I saw all kind of animals being butchered on the spot. Ducks, monkeys, Geese, Chickens, large fish of some type and even some things that I didn't even recognize. They use the hoses with water a lot to wash the blood away from where they are working and into a french drain. The place didn't smell as bad as I had imagine it would, but nonetheless, it smelled.
I was very careful what I ate while I was there, although I did try the deep fired chicken feet and just a taste of the monkey brains AND I do mean just a very small taste of that stuff. I usually ate at the hotel where they served American food and if I was out and about, I would go to KFC or maybe Pizza Hut or places that I was familiar with.