I smell a rat. See here for the juicy details. I can see it now: Excuse me sir/ma’am, have you had your COVID-19 shot? Could you please come here so our dog can screen you?
PHOTO CREDIT: Detection dog training in U.S. Navy military for drug detection By U.S. Navy photo by Mass Communication Specialist 1st Class Peter D. Lawlor – This image was released by the United States Navy with the ID 101108-N-8546L-040 (next).This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing: Public Domain, https://commons.wikimedia.org/w/index.php?curid=12198759