I've not seen anything official about Mexico, but it took a lot of effort to get a pat down at MEX in July vs. being forced to go through the R&S Scanner.
Originally Posted by
stifle
Australia and New Zealand operate a no scan no fly rule if selected, with limited exceptions such as documented disabilities preventing the use. They have R&S QPS scanners in at least some locations (the two walls) so you cannot even say you're unable to raise your arms up.
The United Kingdom does allow opt outs but the alternative pat down will be carried out in a private room followed by a wanding, ETD, and hand search of carry ons. Passengers will often be told there will be a wait of up to 30 minutes for staff to become available for the search.
I knew Australia had the policy about mandatory scanning, but I hadn't heard the same for NZ. Don't suppose you've seen anything online which states the same? I was surprised the airport security website for NZ didn't make any mention of it being mandatory or voluntary.
This
post from 2018 said it was not mandatory, but obviously is a bit out of date.