It's a traditional cultural tattoo so the CN is correct in allowing it because this particular one defines the wears identity. If the tattoo was your stock standard jack tars tat then no way. If the wearer was strictly traditional he would have the moko carved on his face as well as inked. Bugger that for a joke, but that was how it was done in the old days. I have a photo of my great great grandfather with his moko and he was bought up, taught in, lived and trained in the old precolonial ways.
A lady I used to work with husband had his moko done traditionally, since he was also part Samoan he also had his thighs and butt done up in Samoa over a couple of summer visits, also done in the traditional way. I have to give him credit for it, the pain was intense.
History lesson for today.
The word "tattoo" itself comes from the Tahitian tatau, and was introduced into the English language by Cook's expedition.
Cook's Science Officer and Expedition Botanist, Sir Joseph Banks, returned to England with a tattoo. Banks was a highly regarded member of the English aristocracy and had acquired his position with Cook by putting up what was at the time the princely sum of some ten thousand pounds in the expedition. In turn, Cook brought back with him a tattooed Raiatean man, Omai, whom he presented to King George and the English Court. Many of Cook's men, ordinary seamen and sailors, came back with tattoos, a tradition that would soon become associated with men of the sea in the public's mind and the press of the day. In the process sailors and seamen re-introduced the practice of tattooing in Europe and it spread rapidly to seaports around the globe.
Should probably get back on topic.