DoC has confirmed to Newshub there was no 1080 poison in the dead birds left by protesters on the steps of Parliament several weeks ago.
The Department of Conservation has initiated an independent review of a 1080 drop in which cows were killed.
DoC says it is taking the "extraordinary step" to provide public confidence in its operations.
Rules changes will see a nationally-coordinated approach to dropping 1080 poison in conservation areas, Environment Minister Nick Smith has announced.
The new regulations, approved under the Resource Management Act, would see a uniform set of rules applied for the use of the controversial poison.