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John William Tuohy lives in Washington DC

Blue lights

 In the year 2000, Glasgow, Scotland, installed blue streetlights in certain parts of the city to make them more aesthetically pleasing, but, shortly afterward they noticed that crime went down in those areas.

In 2005, a city in Japan installed blue lights in high crime areas, and crime in the area decreased by 9%.

A Tokyo railroad company installed blue lights at train stations experiencing a high number of suicides, and virtually overnight suicide attempts went to zero.

The so-called Blue Light effect is not 100% scientifically proven but there seems to be some minor correlation between the lights and lower crime rates. One theory is that blue light are subconsciously associated with police presence or maybe blue lights have a calming effect since they are also used to treat seasonal depression.