Please answer the following based on the description below:

Technology companies and other organizations have been promoting vaccine passports as a means to securely reopen businesses and borders. some countries have issued some version of those health passes, investigating how digital credential systems may play a key role in the resumption of international travel. While the US federal government has stated that national vaccine passports would not be mandated, several states, like New York, have implemented verification technologies, while others, such as Georgia, Florida, and Arizona, have prohibited their use.

Consumer skepticism and shifting standards regarding how technology businesses manage personal data are two issues that digital vaccine passports must address.

1. What legal challenges are associated with the issuing of vaccine passports?
2. What ethical challenges are associated with the issuing of vaccine passports?
3. How could some of those concerns be allayed? What standards/best practices should apply in this context?