Why are there no encrypted wrist bands for post Covid-19 infection yet?

This is a vital part of re-opening the economy.

Cinemas can re-open for people with the bands for instance. They will be vital in the health care sector.

We ignored organising PPE until it was to late, even with months of notice, why are we still not looking ahead?

There is no evidence of quick reinfection, and in the unlikely possibility it is possible we will quickly realise by formalising the post infection process.