PCGG vs. Sandiganbayan

Rule 6.03 of the Code of Professional Responsibility does not disqualify a former government lawyer from accepting private employment where the "matter" involved in the subsequent engagement is entirely different from the "matter" in which the lawyer intervened while in government service, and where the lawyer's prior participation was insubstantial, such as merely advising on legal procedure or signing an initiatory pleading.

General Bank and Trust Company (GENBANK) faced insolvency in 1976, prompting the Central Bank to extend emergency loans and eventually order its liquidation in March 1977. The Lucio Tan group acquired GENBANK's assets through a public bidding, and the bank was subsequently reorganized as Allied Banking Corporation. Following the 1986 EDSA Revolution, the Presidential Commission on Good Government (PCGG) was created to recover ill-gotten wealth. The PCGG filed complaints for reversion and issued writs of sequestration against properties of Lucio Tan et al., including shares in Allied Bank. Respondents Tan et al. challenged these writs before the Sandiganbayan.

• GENBANK Liquidation: GENBANK became insolvent. Central Bank officials conferred with then Solicitor General Estelito Mendoza. Mendoza advised on the procedure for liquidation under Republic Act No. 265 and filed the petition for assistance in liquidation (Sp. Proc. No. 107812) with the Court of First Instance. The Monetary Board furnished him documents for this purpose. GENBANK was subsequently acquired by the Lucio Tan group and renamed Allied Banking Corporation.
• PCGG Sequestration: PCGG sequestered shares of Tan et al. in Allied Bank and other corporations, alleging they were ill-gotten wealth.
• Disqualification Attempt: PCGG sought to disqualify Mendoza, now private counsel for Tan et al., invoking Rule 6.03 of the Code of Professional Responsibility. PCGG argued Mendoza "actively intervened" in the liquidation of GENBANK, the same bank whose shares were now subject of the sequestration cases.
• Sandiganbayan Rulings: The Second Division denied the motion in Civil Case No. 0005, finding no inconsistency and noting the one-year prohibition under Republic Act No. 6713 had lapsed. The Fifth Division adopted this ruling for Civil Case Nos. 0096-0099.

• Rule 6.03 Violation: Petitioner maintained that Mendoza violated Rule 6.03 by accepting employment in connection with a matter (Allied Bank shares) in which he intervened (GENBANK liquidation) as Solicitor General.
• No Time Limit: Petitioner argued that the prohibition in Rule 6.03 is not time-bound and applies regardless of the lapse of time.
• No Waiver: Petitioner contended that the Central Bank could not waive the objection to Mendoza's appearance on behalf of the PCGG.
• Not Res Judicata: Petitioner asserted that the Resolution in Civil Case No. 0005 was interlocutory and does not constitute res judicata barring the motion in Civil Case Nos. 0096-0099.

• Different Matters: Respondent countered that the liquidation of GENBANK is a different matter from the sequestration of shares in Allied Bank.
• No Adverse Interest: Respondent argued that Mendoza's representation of Tan et al. does not take a position adverse to the Central Bank; in fact, it defends the validity of the liquidation.
• Res Judicata: Respondent maintained that the prior resolution in Civil Case No. 0005 constitutes the law of the case or res judicata.
• Prescription: Respondent asserted that the prohibition under Rule 6.03 should prescribe after a reasonable period.

• Applicability of Rule 6.03: Whether Rule 6.03 of the Code of Professional Responsibility applies to disqualify respondent Mendoza from representing respondents Tan et al. in Civil Case Nos. 0096-0099.
• Definition of "Matter": Whether the "matter" of advising on the liquidation procedure of GENBANK is the same "matter" as the sequestration of shares in Allied Bank.
• Definition of "Intervention": Whether advising the Central Bank on liquidation procedure and filing the petition for assistance constitutes "intervention" under Rule 6.03.

• Applicability of Rule 6.03: Rule 6.03 does not apply to disqualify Mendoza because the elements of "matter" and "intervention" are not met in a way that links his former government service to his current private employment.
• Definition of "Matter": The "matter" of advising on liquidation procedure is not the same as the "matter" of sequestering shares. Advising on procedure involves interpreting government regulations or laws, which ABA Formal Opinion 342 explicitly excludes from the definition of "matter." Furthermore, the parties, issues, and relief sought in the liquidation proceeding are entirely different from the sequestration cases. The legality of the liquidation is not an issue in the sequestration cases.
• Definition of "Intervention": "Intervention" under Rule 6.03 must be substantial and significant, not insubstantial or insignificant. Mendoza's acts—advising on black-letter procedure and signing an initiatory pleading—were formal and did not involve the exercise of discretion or influence over the decision to liquidate or the sale to the Tan group.

• Rule 6.03, Code of Professional Responsibility — Prohibits a lawyer from accepting engagement after leaving government service in connection with any matter in which he had intervened. "Matter" refers to a discrete, isolatable transaction involving a particular situation and specific party, not the drafting or interpreting of general regulations or laws. "Intervention" requires substantial participation or the power to influence the proceedings, not merely formal or insignificant acts.
• Congruent-Interest Representation Conflict — A conflict unique to government lawyers where disqualification is sought even if the interests of the former government client and the new private client are parallel. This applies to prevent the appearance of impropriety or the use of influence, but requires a showing of substantial intervention in the same matter.

• "The subject 'matter' of Sp. Proc. No. 107812, therefore, is not the same nor is related to but is different from the subject 'matter' in Civil Case No. 0096. Civil Case No. 0096 involves the sequestration of the stocks owned by respondents Tan, et al., in Allied Bank on the alleged ground that they are ill-gotten. The case does not involve the liquidation of GENBANK. Nor does it involve the sale of GENBANK to Allied Bank."
• "In fine, the intervention cannot be insubstantial and insignificant."
• "To make government service more difficult to exit can only make it less appealing to enter."

• ABA Formal Opinion 342 — Followed. Defined "matter" as a discrete, isolatable transaction, excluding the drafting or interpreting of general regulations or laws.
• General Motors Corporation v. City of New York — Distinguished/Cited by dissent. Disqualified a former government lawyer who signed a complaint, but distinguished in the majority opinion because Mendoza's intervention was not substantial.

• Rule 6.03, Code of Professional Responsibility — The central provision. Interpreted to require identity of "matter" and substantial "intervention."
• Section 29, Republic Act No. 265 — The provision on bank liquidation. Cited to show that the procedure Mendoza advised on was "black and white" and did not involve discretionary legal innovation.

Davide, Jr., C.J., Quisumbing, Ynares-Santiago, Sandoval-Gutierrez, Carpio, Austria-Martinez, Corona, Garcia, JJ. - Sandoval-Gutierrez, J. Concurred in the result. Argued that the order denying disqualification is a final/appealable order and res judicata applies. - Panganiban, J. Voted to dismiss based on res judicata (conclusiveness of judgment) and proposed a 5-year prescriptive period for Rule 6.03. - Tinga, J. Voted to dismiss based on the non-retroactivity of the Code of Professional Responsibility (promulgated 1988) to acts done in 1977.

• Callejo, Sr., J. — Argued that Mendoza violated Rule 6.03. The "matter" of liquidation is connected to the "matter" of sequestration of shares. Advising on procedure and filing the petition constitutes "intervention." The "congruent-interest representation conflict" doctrine applies even if interests are aligned. Rule 6.03 has no prescriptive period.
• Carpio-Morales, J. — Argued that res judicata does not apply because the prior order was interlocutory. Rule 6.03 applies because the matters are related. The prohibition is perpetual and valid as a regulation of the legal profession.