I think the primary issue with drug sniffing dogs is that the handlers aren’t inclined to care about the veracity of the result and would probably prefer the d

I think the primary issue with drug sniffing dogs is that the handlers aren’t inclined to care about the veracity of the result and would probably prefer the dog to trigger a positive result because it gives them a free pass on probable cause. The dog is likely rewarded regardless as well which is why you get high profile cases of dogs that alert 90+% of the time. They were literally trained to do it. The same thing can’t necessarily be said for cancer detection. There isn’t a strong motivation to skew the results by the handlers and presumably any positive response would entail further diagnostic testing. I suppose cynically you could apply the same logic so that medical providers can justify the use of more expensive diagnostic testing but I’d like to think it’s not quite that bad.