The Government pays about $5000 to test each product it suspects may be synthetic cannabis - a cost Associate Health Minister Peter Dunne says it is "prepared to bear".
"We currently have the Temporary Drug Class Notices regime which is focused on delivering safety first for young New Zealanders. This regime is specifically temporary."
Next year, a permanent law will be introduced which will require manufacturers to prove the safety of their products and pay for associated expenses.
On Saturday Enjoi Products released a repackaged and modified version of its Amsterdam Cafe synthetic cannabis to convenience stores across Auckland.
Managing director Zaid Musa said other firms were gearing up to re-release modified synthetic cannabis products. And the Herald understands at least one synthetic cannabis product, labelled "herbal tea", has been sold since the day after the bans in August.