I try not to fly and this is one of the major reasons I find flying so annoying. I've been through airports where they just use bomb sniffing dogs, why can't that be the norm?
It's a supply issue from what I've read. Most bomb sniffing dogs are sourced from overseas and there's a high demand for them globally. There simply aren't enough dogs that are capable. Even from a litter, there's a chance none of them will qualify after training, much like legit service dogs. We also use a lot of dogs to sniff for drugs.
https://reason.com/video/2014/09/16/dog/
https://reason.com/2021/05/13/the-police-dog-who-cried-drugs...