Cobb County Superintendent Chris Ragsdale told board members before the vote that the district only has 67 officers currently for its 114 schools, and that competition to hire police officers is intense.
i can think of more useful roles they might hire. because while i might be reading this page wrong, from what i could find ( here and here ), they have a grand total of 5 school nurses and 35 social workers.
I wonder. In the case of hands-free sinks and dispensers, the problem is very simply that they only calibrated things to white people. In the case of oximeters though I think it might be genuinely harder to measure what’s going on inside a dark hand than a light one. I mean, just visually I can look at my finger and see color from hemoglobin, in a way that people with lots more melanin can’t. Algorithms can only correct for so much if the source data isn’t measured well.
Oximetry doesn’t use the absolute value, though. It uses the differential signal between two wavelengths that are absorbed by oxyhemoglobin and deoxyhenoglobin at different levels. That’s why adding a third wavelength that doesn’t have different absorbtion would help set the baseline. It should also be possible for the system to detect low transmission (due to dark skin or even just a thicker finger) and increase LED output level to compensate.