Beakers have been required tobbe present at all Pemex gas stations for over 20 years.
However, the pumps can be controlled electronicaly to dispense less gas before or after you take a measurement.
Nafta concessions for foriegn gas stations were part of that agreement too.
In fact sometimes the owner will place a micro switch under a pad so that the pumps only steal when the test flask is on top of the switch turning it on to position the second steal gear with fewer teeth pushing the the piston measuring pump.
What a great Freudian slip!