Two jars of Fremont's own Gerber baby food have been tampered with, and later sold and fed to infants in California. Neither of the infants who ate the food containing ricin is ill, but the contamination, which came from ground up castor beans, has some concerned.
To prevent eating food that's been tampered with, experts advise listening for a popping noise when opening jars of food. The noise usually means the vacuum seal is secure, but Professor Bruce Harte at Michigan State University's School of Packaging says that's not always a fool proof way to ensure your food is safe. Harte says there's always a possibility that someone who knows the containers, the products, and the process can get into the container and later reset the seal, although it's not something just anyone would be able to do.
To be on the safe side, experts say you should try to buy food kept in containers with plastic seals, and check canned food carefully before eating it.