/ Taking chalk to New Zealand?
Didn't have an issue when I took it in hold luggage.
In my case, never mentioned it. They have kit to test anything suspicous for drugs and in the worst case - ie. you get stopped, it would soon draw a blank.
Chalk isn't prohibited.
Divide it up into small plastic ziplock bags of say 2g and hide it about your self. You'll be fine.
Or if you don't have any ziplock bags handy, tie off condoms.
The kiwis are rightly worried about things coming into contaminate the ecosystem, but their main concern is over little critters and plants that can reproduce and take over the place. Given your chalk's inability to reproduce, a small bag can't have a devastating effect on the ecosystem.
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