Either those people are breaking the law and driving impaired or not. If they are driving impaired, then the solution to the injustice is not to let them go, b

Either those people are breaking the law and driving impaired or not. If they are driving impaired, then the solution to the injustice is not to let them go, but to arrest more impaired white drivers. If they are not driving impaired, but being arrested based on the subjective opinions of the police officer, then this device can help their defense in court. Either way, I don't see how this device is making things worse.