Yes, of course. A number of things are happening in Europe, where mobility and travel is the subject of much discussion, especially in Great Britain. We can look to that part of the world for guidance on the rules to implement and the technologies to use.
I know proof of vaccination is also an issue that is being discussed. Tourism operators have no problem with such a requirement, provided that it does not hinder their business, of course, and that there is some consistency in the proof selected and the technology required.