Rappler sources said the vote was 11-4 in favor of Arroyo's petition to junk a Sandiganbayan ruling that gave the go-signal for her plunder trial in connection with charges that she misused funds of the state-run Philippine Charity Sweepstakes Office (PCSO).

The justices who dissented or voted against Arroyo are Chief Justice Maria Lourdes Sereno, Senior Associate Justice Antonio Carpio, and Justices Marvic Leonen and Benjamin Caguioa. Of the 4, only Carpio is an appointee of Mrs Arroyo; the rest were appointed by former president Benigno Aquino III.

The 11 justices who ruled in favor of the former president are:

Justice Presbitero Velasco Jr

Justice Teresita de Castro

Justice Arturo Brion

Justice Diosdado Peralta

Justice Lucas Bersamin

Justice Mariano del Castillo

Justice Jose Perez

Justice Jose Mendoza

Justice Bienvenido Reyes

Justice Estela Perlas-Bernabe

Justice Francis Jardeleza

Of the 11, eight are Arroyo appointees and 3 were appointed by Aquino: Bernabe, Reyes and Jardeleza.

'Final bastion of justice'

One of Arroyo's lawyers, Raul Lambino, is with her at the Veterans hospital.

He told radio station dzMM: "Kasama ko nga po si Pangulong Arroyo rito at lubos po yung ating kagalakan ngayon dito sa naging botohan o info na dumating sa amin. Naiyak po siya siyempre lahat ng mga kasama namin rito sa magandang balitang dumating sa atin." (I am with President Arroyo, and we're grateful for the decision or the information that reached us. We are all in tears.)

"Para sa akin, malaya na ang dating Pangulo," he added. (As far as I am concerned, our president is free.)

Lambino said the Philippine National Police would process Arroyo's release after the SC releases its verdict.

Arroyo’s other lawyer, Ferdinand Topacio, said in a statement: "The Supreme Court has once again proven itself to be the final bastion of justice and the rule of law. Its ruling today has validated what we have been saying for six years now: that the charges against former President Gloria Macapagal-Arroyo are nothing more than disingenuous attempts at political persecution by a corrupt and inept Aquino administration intent on covering up its gross lack of accomplishments by harassing its political opponents." (READ: Arroyo camp: Acquittal proves 'political persecution' by Aquino)

The Court found the evidence against her weak, the same sources said. Prior to this, the Supreme Court already stopped her trial at the Sandiganbayan.

The 69-year-old Arroyo, who is currently Pampanga representative, is the second Philippine president to be detained for plunder.

In April 2001, ousted president Joseph Estrada was jailed for plunder over charges of unexplained wealth. The Sandiganbayan convicted and sentenced him to life in jail in September 2007. But only 6 weeks after, in October 2007, his successor Arroyo pardoned him.

Landmark ruling

Tuesday’s landmark ruling on Mrs Arroyo came barely a month after Aquino stepped down from office and less than a week before President Rodrigo Duterte, who favors her release, delivers his first State of the Nation Address (SONA.) (READ: Duterte ready to grant Arroyo pardon)

It was Aquino who jailed Arroyo and subsequently led the impeachment charge against her appointed chief justice, the late Renato Corona.

Through veteran lawyer Estelito Mendoza, Arroyo had petitioned the Supreme Court to approve her "demurrer to evidence," a plea to dismiss a case on the basis of weak evidence. She went to the High Tribunal for relief after the anti-graft court Sandiganbayan dismissed the demurrer. (READ: What has happened to the Arroyo plunder case?)

Arroyo filed the "demurrer to evidence" in 2014 before the Sandiganbayan. The anti-graft court dismissed this in April 2015, paving the way for her trial for plunder over the alleged misuse of PCSO funds.

Arroyo then challenged the Sandiganbayan ruling before the Supreme Court in a 100-page petition filed by Mendoza.

PCSO plunder

The Court's approval of the Arroyo petition in effect acquits her of the P366-million plunder suit filed by the Ombudsman in July 2012 against her and 9 other former goverment officials.

The Ombudsman's suit, filed a week before then President Aquino was to deliver his 3rd SONA, alleged that Mrs Arroyo approved the alleged diversion of PCSO's intelligence funds for purposes not related to the core work of the agency, which is to help indigents and sectors working with them.

On top of this, Arroyo had also asked the Supreme Court to in the meantime stop her trial at the Sandiganbayan. The SC granted this motion last year and extended the trial suspension to this year. – Rappler.com