Noxious Weeds Act 1993 No 11
46 Use of force
(1) Reasonable force may be used for the purpose of gaining entry to any premises (other than residential premises) under a power conferred by this Part by an inspector, authorised officer or other person, but only if authorised by the local control authority in accordance with this section.(2) No force is to be exercised in any case unless the local control authority has authorised in writing (either generally or in the particular case) the use of force in the circumstances of the case.(3) A general authority given by the local control authority for the use of force is invalid. The authority is to specify the circumstances which are required to exist in a case before force may be used.