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https://www.newsweek.com/saline-injected-instead-covid-vaccine-south-carolina-1605087
That will always be a problem. Many unusual things can be brought into a massive vaccination effort; like what you mentioned , also cutting back the dosage to further the amount of people to be vaccinated, also substituting another vaccine in place of the asked for vaccine; and using expired vaccines,etc..
Making up counterfeit vax info for sale is also to be expected. -Tom