Northeast district police chief ACP Anuar Omar said the woman had been spotted giving out sachets of white coffee at a market in Jelutong.
“Witnesses told us that the woman had a big box of sachets and was giving it out for free.
“We found a few packets of the coffee near a market in Jelutong and also a few discarded packets at the foot of Penang Hill,” Anuar told reporters today.
He also advised the public to not consume any beverages given by strangers.
Five people, aged between 19 and 62, sought treatment for fatigue and weakness after consuming the “MyCafe Penang Durian White Coffee” premix last week.
MyCafe believed its sachets had been tampered with as they were heavier than usual, and has lodged a report with the police.
In the latest cases reported on Saturday, two men lodged reports at the Sungai Nibong police station, complaining of being sick after consuming “Penang White Coffee” which was also manufactured by the same company.
Their blood and urine samples have been sent to the Chemistry Department, together with the coffee sachets, for analysis.
The latest cases bring the total number of victims to seven, including two women.
Singapore has since banned the sale of “Penang Durian White Coffee” from its shelves.
In Malaysia, Health Minister Dr S Subramaniam said the ministry was still investigating the samples of coffee and had “no immediate intention of withdrawing it from the shelves”.