Section 96Local Government Code of 1991 (Republic Act No. 7160), Sec. 96

Permission to Leave Station. -

(a) Provincial, city, municipal, and barangay appointive officials going on official travel shall apply and secure written permission from their respective local chief executives before departure. The application shall specify the reasons for such travel, and the permission shall be given or withheld based on considerations of public interest, financial capability of the local government unit concerned and urgency of the travel.

Should the local chief executive concerned fall to act upon such application within four (4) working days from receipt thereof, it shall be deemed approved.

(b) Mayors of component cities and municipalities shall secure the permission of the governor concerned for any travel outside the province.

(c) Local government officials traveling abroad shall notify their respective sanggunian: Provided, That when the period of travel extends to more than three (3) months, during periods of emergency or crisis or when the travel involves the use of public funds, permission from the Office of the President shall be secured.

(d) Field officers of national agencies or offices assigned in provinces, cities, and municipalities shall not leave their official stations without giving prior written notice to the local chief executive concerned. Such notice shall state the duration of travel and the name of the officer whom he shall designate to act for and in his behalf during his absence.