‘Immunity Passports’ Exist, But Are They a Bad Idea?

‘Immunity Passports’ Exist, But Are They a Bad Idea? It might seem counterintuitive that, instead of needing a negative COVID-19 test to cross international borders, you could offer proof that you’d previously tested positive? Yet, these so-called ‘immunity passport’ policies already exist in certain countries, operating on the assumption that, having been infected and recovered, a person can’t contract or carry the virus again.