I was at a dog show recently and stopped to admire a CKCS and spoke to the owner. She said yes she did breed but did not have all the health tests done as she knew her dogs were healthy.
Given that this is a breed with a serious problem so testing would be more to the point, I'd not necessarily take this as meaning this breeder was irresponsible - necessarily. In my own breed, with breeders who had been involved in the breed for ages, producing generation after generation of puppies without any problems, then I could understand this 'my dogs are healthy' comment. She could be correct.
Example. A problem with eyes cropped up in my breed - a condition leading, possibly, to glaucoma. One breeder panicked and had her stock tested. Understandably as it turned out that many of those she put through the gonioscopy test actually failed. This test doesn't mean the dog will go on to develop glaucoma, just that there is a predisposition there. As I'd used the same dog, a recently imported American Champion too, I had one of the leading eye specialists on the phone (cold call) saying we'd better test your puppies. I said hang on, I have no reason to suppose mine are at risk just because this other breeder had cause to (the line producing this was clearly via the bitch side, as it turned out later). He backed right off. To this day, I stand by my decision and we had no cases of glaucoma in my bloodline (now ended because the last outside stud we used developed epilepsy and although again this didn't run in my line, I didn't want to risk being responsible for passing this on). The imported American dog, who was only here for a couple of years before going back to the States, was tested - clear.
So although I'd be testing with something like the serious condition affecting many CKCSs, I'd not be too down on this exhibitor, without knowing all the facts. Was a time when responsible breeders knew when testing was needed, and when it wasn't.