Police only have to be 18 years old to make quick life & death decisions, 7 years before judgment-making frontal lobes are fully developed, especially in males.
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"In addition to increasing the minimum age for police officers from 18 to 21, the new law will also work to establish a college education requirement, involving courses in psychology, ethnic studies, law and others. A 2010 study that found college-educated police officers in two cities were less likely to use force in encounters with suspects."
This is a good idea but police departments will also have to raise starting pay to attract these better educated, older, recruits who will have more options.