They also tested the tainted oil for any heavy metals , aflatoxin and benzopyrene , which may cause cancer in humans .
The FDA immediately released a list of 235 food companies around Taiwan that had reportedly purchased the tainted oil products .
FDA also tested the tainted oil for any heavy metals , aflatoxin and benzopyrene , which may cause cancer in humans .
The FDA immediately released a list of 235 food companies around Taiwan that had reportedly purchased the tainted oil products .