The Taiwan Food Good Manufacturing Practice Development Association ( TFGMPDA ) reported that the cooking oil produced by Chang Guann has never been awarded GMP certification .
The Taiwan Food Good Manufacturing Practice Development Association issued an apology saying that five food companies whose products have won GMP certification have used the tainted oil .
The Taiwan Food Good Manufacturing Practice Development Association ( TFGMPDA ) reported that the cooking oil produced by Chang Guann has never been awarded GMP certification , although the TFGMPDA issued an apology saying that five food companies whose products have won GMP certification have used the tainted oil .