The agency or officer, specified under section 20 or section 21, may, with prior intimation to the Development Commissioner concerned, carry out the investigation, inspection, search or seizure in the Special Economic Zone or in a Unit if such agency or officer has reasons to believe (reasons to be recorded in writing) that a notified offence has been committed or is likely to be committed in the Special Economic Zone:
Provided that no investigation, inspection, search or seizure shall be carried out in a Special Economic Zone by any agency or officer other than those referred to in sub-section (2) or sub-section (3) of section 21 without prior approval of the Development Commissioner concerned:
Provided further that any officer or agency, if so authorised by the Central Government, may carry out the investigation, inspection, search or seizure in the Special Economic Zone or Unit without prior intimation or approval of the Development Commissioner.