Collecting beach glass and shells is still allowed. But if you're collecting shells for the purposes of commercial activity, a Commercial Marine License is required per HRS §189-2,3 and Hawai'i Administrative Rule §13-74-20.
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For example, some experts say the removal of shells can impact shoreline erosion patterns. This could have dire effects on coastal populations, especially in combination with global warming and rising sea levels. Not only that, but every shell performs some ecological role.