Son of milk tea shop owner face murder raps

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(CNN Philippines) — Police filed murder cases against the ErgoCha shop owner's son after autopsy revealed traces of oxalic acid in the blood samples and gastric contents of the milk tea poisoning victims.

"The oxalic acid, based on record, was seen in the recovered evidence which include the Hokkaido [milk tea] and the syrup. The same oxalic acid [was] found in the intestines of the victims," P/Supt. Dennis Wagas of the Manila Police District (MPD) said in Filipino on Monday (May 11).

The MPD also has as evidence a CCTV footage, taken after the incident, showing Lloyd Abrigo disposing what seems to be the remaining milk tea.

At that time the victims were already at the hospital.

The oxalic acid is classified as a poisonous substance, which is qualified for a case of murder based on the revised penal code, according to the MPD.

Two counts of murder and one count of frustrated murder were filed against Lloyd.

Related: Manila Police District probes milk tea incident

On April 9, the couple Suzaine Dagohoy and Arnold Aydalla ordered Hokkaido milk tea from the shop and complained to owner, William Abrigo, that their order tasted different.

William, who prepared the drink, also drank it in an attempt to prove that there was nothing wrong.

Minutes after, he and Dagohoy had convulsions and then collapsed. They were later declared dead at the hospital.

Aydalla, on the other hand, survived.

According to the U.S. National Library of Medicine, symptoms of the poisonous oxalic acid include abdominal pain, loss of consciousness, convulsions, shock, vomiting, and a weak pulse, among others.

A colorless granular powder, it is used for cleaning silver, bleaching clothes, and removing rust.

A lethal dose could damage the gastrointestinal tract and the airway which could quickly cause death.

"Actually, its lethal dose is from 9.5 up to 10 micrograms per milliliter. So, in this case it exceeded that which led to the deaths," Philippine National Police (PNP) Crime Laboratory director, C/Supt. Theresa Ann Cid, said in Filipino.

In another statement by Cid on Monday, she explained that the average human body contains around four liters of blood, in which about 40mg of the poisonous acid could lead to death.

The Department of Health (DOH), in an earlier analysis of the milk tea, said it found no toxic substance in the samples.

But it said that common symptoms among the poisoned victims were muscle twitching and seizures.

Related: DOH: No toxic substance found in milk tea samples

The PNP is also waiting for results of the histopathology or tissue exam to come out.

It said that it cannot conclude that the victims' cause of death was the oxalic acid until the results arrive.

CNN Philippines' Paul Garcia contributed to this report.