There ya go, bud:

• https://pubmed.ncbi.nlm.nih.gov/24631776/
• https://www.npr.org/sections/thetwo-way/2011/01/07/132738250/report-drug-sniffing-dogs-are-wrong-more-often-than-right
• https://health.ucdavis.edu/common/includes/shared/features/2010-2011/02/20110223_drug_dogs.html

This is well studied in academia by animal behaviorists, so there are many many more studies. That said, I recommend the article shared by @mutilationwave.