This isn't correct. The public safety exemption to Miranda rights DOES allow the results of questioning to be used as evidence. That is what is happening here.

This isn't correct. The public safety exemption to Miranda rights DOES allow the results of questioning to be used as evidence. That is what is happening here. This exception stems from https://en.wikipedia.org/wiki/New_York_v._Quarles https://en.wikipedia.org/wiki/New_York_v._Quarles