Police services like the NYPD and the LAPD are bona fide pop culture staples that have been featured in countless movies and TV shows. Their distinctive blue uniform is known the world over, but have you ever stopped to think, “Well, why is it blue?”  If so, wonder no more. It turns out, beyond some of the modern reasoning for continuing to do it, there initially was a very simple explanation as to why blue was chosen.

For starters, why they keep the colour today- according to “The Psychological Influence of the Police Uniform“, the colour blue has several functions in relation to a police uniform, one of the main ones being that it is much easier to clean and maintain than a lighter/brighter colour and that it shows stains and marks less easily. Intuitively, this makes a lot of sense. If someone was thinking of buying 18,000 police uniforms, they’d probably want to buy the ones that were easiest to clean. Also, nobody would trust a police officer in a dirty uniform unless he was currently holding a kitten he’d just pulled from a fire or the like; decking officers out in a uniform that doesn’t show stains easily is just good common sense.

Another reason listed by the boys in blue today is that the dark shade of navy blue makes an officer harder to see at night, making it easier for them to sneak up on bad guys. In fact, in 1996 Baltimore County police officers working the graveyard shift stopped wearing white uniform shirts for that exact reason. Of course, whether this is really helping the officers or not is up for debate. This change wasn’t backed up by studies or research of any kind, but to quote one of the officers involved in the switch “The officers feel safer with the dark shirts on at night. It’s the perception, and the perception is as important as reality.”

Speaking of psychology, according to a study done at the University of Georgia on 98 test subjects (Color-emotion associations: Past Experience and Personal Preference), the colour blue subconsciously evokes feelings of comfort and security in most people, supposedly making it a good choice for people in a position of authority to wear. Now, we should point out that colour psychology, while currently being heavily researched particularly by marketers with compelling results, is not yet fully understood, so take that previous sentence with a pinch of salt (or perhaps a mug full).

So up to this point, it’s really just been a matter of practicality and a bit of pseudoscience in terms of why police wear blue.  But is that why police first started wearing these colours?  It turns out there is a little more to it than that. As recorded in the History of the LAPD, when standardized uniforms became a thing for the police across America shortly after the mid-19th century, years after the first state wide law enforcement agency (now known as the Texas Rangers) had been established in 1835, many officers were simply given surplus (navy blue) Union army uniforms to wear.

Conversely, over in the UK when the 1829 Metropolitan Police Act was brought into effect, essentially creating the country’s first proper paid police force, they made the deliberate choice to dress their officers in blue to contrast with the, then bright red uniforms worn by the British military. This choice was made almost entirely to distinguish the officers from military personal, and hopefully help make them look more like regular people on the street; it was also partially for this reason that initially, the police in the UK were unarmed. In fact, for a time the police in the UK were literally only given a rattle to call for help with and a wooden truncheon.

Regardless of the initial reasoning behind the choice of the colour blue for uniforms, it stuck and as the uniforms in both respective countries were redesigned and made more comfortable and functional for officers as the years went on, the colour scheme has remained, for the most part, the same.

As you’re probably aware, not all police officers in the states wear the traditional blue uniform you’d see on a beat cop in say, New York City.  This is mostly due to the fact that historically each state was responsible for designing and implementing uniforms for its officers. As a result, not every state went with the “just chuck ’em in old Civil war uniforms approach“. In fact, initially, many police officers didn’t even want uniforms due to the fear it would make them a target of mob violence and ridicule. (Not surprisingly, many officers saw fit to arm themselves before guns became standard issue.) As an example of just how resistant to this change some law enforcement agencies were, the Orange County Sheriff’s office didn’t make a uniform compulsory for its officers until 1938.

If you liked this article, you might also enjoy our new popular podcast, The BrainFood Show (iTunes, Spotify, Google Play Music, Feed), as well as:

• Why Police are Called “Pigs” and Why in England They are Called “Bobbies”
• What Started the “Cops Eating Donuts” Stereotype
• Are You Really Entitled to a Phone Call When Arrested?
• How Did “911″ Become The Emergency Call Number in North America?
• Why Is It Illegal to Remove Your Mattress and Pillow Tags?

Bonus Fact:

• Sports teams or athletes wearing red have been noted to consistently perform better in various forms of competition over the long haul. Why? Well, no one really knows, but one study to determine the root cause indicated the officials may be at least partially to blame.  Specifically, “As part of their study, the researchers had 42 experienced Taekwondo referees watch two videos, each of which included 11 fight sequences. In the first video, one athlete wears a red trunk protector while the other wears a blue one. The second film shows the same exact scenes, but with the athletes’ colors switched by digitally manipulating the tapes… On average, athletes scored 13 percent more points when they were wearing red than blue.”