identify the food born contamination and prevent it altogether, jenna. >> how do you do that, johnathon? >> they are dangerous. what can grocery stores do to protect their customers. >> grocery store is a great example. they have customer loyalty cards. you are seeing retailers using the data used from customer purchases with these cards. they can rapidly identify and alert these customers who may have been exposed to an outbreak. >> and more of the reasons to hand over your information. i know it is difficult. >> it is a tradeoff. >> thank you very much. it is a story we'll watch. >> and a new look at the mystery to a new york estate fortune. several peoplulose to robert dufrt ended up dead.