The portable breathalyzer is inadmissable in court in my and most states. The Simon Says game is though (but it can be refused without penalty, hypothetically).
Why would a certified calibrated breathalizer test be inadmissible in court? How is it any different from catching speeders with a laser gun, or doing a DNA test?
And if giving every cop a calibrated breathalizer is too expensive: give them a reasonably-accurate one for in the field, then take everyone who fails it to the station for a retest on an expensive calibrated one.
This is changing. Most states have “permanent” properly calibrated breathalyzer at every dui checkpoint now. And in an increasing number of regular vehicles
The portable one is used as an indicator.
A positive result will get you arrested and taken to the station, where they have the (non-portable) court admissible calibrated kit.