Idlis in Bengaluru are found to be unsafe due to the use of plastic sheets during steaming, which introduces toxic chemicals into the food. Tests by the state food safety department revealed that 54 out of 251 idli samples contained carcinogenic substances hazardous to health.Idlis in Bengaluru are found to be unsafe due to the use of plastic sheets during steaming, which introduces toxic chemicals into the food. Tests by the state food safety department revealed that 54 out of 251 idli samples contained carcinogenic substances hazardous to health.