May 8, 2021 11:28 AM By Jason Hanna, CNN Posted: Updated: Covid-19 vaccination record cards can easily be forged, and US law enforcers are keenly aware. And more than 40 state attorneys general last month warned social media and online shopping platforms to crack down on sales of blank or fraudulently completed cards. So, what’s prompting the warnings? More places are requiring vaccination proof But elsewhere, businesses, venues and events are increasingly offering special access or treats to those who can show this evidence, if not flat-out requiring proof for service. Many initiatives are underway to create tamper-resistant printed or digital vaccine passports, like one used in New York. Such passports involve checking user-entered data against state or other immunization registries with the user’s permission, meaning a user would have pre-verified evidence to show a business.