With more employers mandating vaccines for their employees, and businesses, cities, and schools doing the same for customers and other non-employee visitors, more people who resist the vaccine are turning to fake vaccine cards to remain employed or otherwise gain access.
As I wrote a few months ago, using a fake vaccine card is a federal crime. 18 U.S.C. sec. 1017 criminalizes the fraudulent or wrongful use of a government seal (in this case, that of the CDC). It is punishable by imprisonment of up to five years.
The illegality, however, hasn't stopped people, and the market is growing.