Why Don't We Have Cancer-Sniffing Dogs?

There are a lot of stories out there about dogs who seemed to smell lung cancer on their owner’s breath, and a recent study found that some dogs can detect lung cancer in blood samples with astonishing accuracy. So why aren’t there domestic dogs trained to detect cancer in every hospital on the planet?

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Sources:
https://www.americanveterinarian.com/news/cancersniffing-dogs-where-are-we-today
https://www.economist.com/science-and-technology/2019/03/28/scientists-discover-the-chemicals-behind-the-unique-parkinsons-smell
https://www.sciencedaily.com/releases/2019/04/190408114304.htm
https://www.medicalnewstoday.com/articles/323620.php
https://www.ncbi.nlm.nih.gov/pubmed/22012770
http://flipper.diff.org/app/items/6954
https://www.mdpi.com/1424-8220/11/1/1105/htm
https://www.cancer.org/cancer/breast-cancer/screening-tests-and-early-detection/mammograms/limitations-of-mammograms.html
https://www.scientificamerican.com/article/if-dogs-can-smell-cancer-why-dont-they-screen-people/?redirect=1
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6042482/
https://www.popsci.com/problem-with-cancer-sniffing-dogs
https://www.bbc.com/news/magazine-26472225
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0069602#B3
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5087496/
https://www.medicalnewstoday.com/articles/323620.php
https://erj.ersjournals.com/content/34/1/261
http://goodcanineacademy.org/index.php/cancer-sniffing-dogs/
https://www.thelungcancerproject.org/screening/?c=ale-16aa37935e0&gclid=CjwKCAjw8-LnBRAyEiwA6eUMGng06lXr7I_7TO2FyoBrBF7YygjIlxV6R5E2_svS-ONiltY2k-9hxRoCiHEQAvD_BwE&gclsrc=aw.ds
https://www.news-medical.net/health/What-is-a-Biomarker.aspx

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