Considering that the questioned regulation would affect the substantive rights of respondent as explained above, it therefore follows that petitioners should have applied the pertinent provisions of Book VII, Chapter 2 of the Revised Administrative Code, to wit:
Section 3. Filing. – (1) Every agency shall file with the University of the Philippines Law Center three (3) certified copies of every rule adopted by it. Rules in force on the date of effectivity of this Code which are not filed within three (3) months from that date shall not thereafter be the bases of any sanction against any party of persons.
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Section 9. Public Participation. - (1) If not otherwise required by law, an agency shall, as far as practicable, publish or circulate notices of proposed rules and afford interested parties the opportunity to submit their views prior to the adoption of any rule.
(2) In the fixing of rates, no rule or final order shall be valid unless the proposed rates shall have been published in a newspaper of general circulation at least two (2) weeks before the first hearing thereon.
(3) In case of opposition, the rules on contested cases shall be observed.
When an administrative rule is merely interpretative in nature, its applicability needs nothing further than its bare issuance, for it gives no real consequence more than what the law itself has already prescribed. When, on the other hand, the administrative rule goes beyond merely providing for the means that can facilitate or render least cumbersome the implementation of the law but substantially increases the burden of those governed, it behooves the agency to accord at least to those directly affected a chance to be heard, and thereafter to be duly informed, before that new issuance is given the force and effect of law.[20]
Likewise, in Tañada v. Tuvera,[21] we held:
The clear object of the above-quoted provision is to give the general public adequate notice of the various laws which are to regulate their actions and conduct as citizens. Without such notice and publication, there would be no basis for the application of the maxim “ignorantia legis non excusat.” It would be the height of injustice to punish or otherwise burden a citizen for the transgression of a law of which he had no notice whatsoever, not even a constructive one.
Perhaps at no time since the establishment of the Philippine Republic has the publication of laws taken so vital significance that at this time when the people have bestowed upon the President a power heretofore enjoyed solely by the legislature. While the people are kept abreast by the mass media of the debates and deliberations in theBatasan Pambansa – and for the diligent ones, ready access to the legislative records – no such publicity accompanies the law-making process of the President. Thus, without publication, the people have no means of knowing what presidential decrees have actually been promulgated, much less a definite way of informing themselves of the specific contents and texts of such decrees. (Emphasis supplied)
Because petitioners failed to follow the requirements enumerated by the Revised Administrative Code, the assailed regulation must be struck down.
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