Nate Lewis, professor of chemistry at Caltech developed something called sensory vapor technology. An electronic way to sniff out bombs and certain illnesses. It would actually help to avoid any risk in scenarios where it would pose a risk to an actual human being.
The eNose is still in its early stages of development, but the world is already ready for it. Fewer and fewer medical students are choosing to become primary care physicians, pointing to an era where we'll probably need to have an app to diagnose us.