The showers may be "widespread and heavy" on a few days.
An NUS spokesperson confirmed that there were no injuries or damage to vehicles.
Malaysian authorities called it a case of "scammers scamming scam victims".
A 36-year-old male car driver is assisting the police with investigations.
The treatment must begin within the week to maximise her chances of survival.
According to Soh Rui Yong, this was the first time SEA Games used names on race bibs.
The drugs they had smuggled were reportedly enough to supply about 25,000 people.
A witness said the couple's actions lasted over an hour in full view of the public, making her feel uncomfortable.
Under public pressure, the 'buyer' later transferred some money to the woman, but it was less than the agreed amount.
"What's the long lens for?" one netizen questioned.