Singaporean Ouyang Xiangyu, 27, now faces a trial in California after being charged with four counts of poisoning the drinking water of classmates at her graduate studies lab in Stanford University last year.
Currently out on US$50,000 bail but not allowed to leave the country, she is expected to plead not guilty due to insanity.
The Agency for Science, Technology and Research (A*Star) told The Straits Times yesterday that it was "deeply concerned" over the incident. "There will be no action on our part until after the proceedings have concluded," a spokesman said.