Thirty foods have failed Centre for Food Safety checks in August.
They include two frozen dried sardine samples which were found to contain histamine, a biotoxin. The results of the remaining 28 samples were announced earlier and included a fruit sample containing an undeclared colouring agent and fresh pork samples that contained sulphur dioxide.
The centre tested 11,200 food samples in August and saw an overall satisfactory rate of 99.7%.
About 4,300 food samples were taken for chemical tests, 1,900 for microbiological tests, and the remainder were checked for radiation.
