Sheldon wrote: I
> still would like to see the idea I came up with, some ten years ago
> now, that all foods requiring refrigeration contain a tamper proof
> chemical sensor in it's packaging that would indicate when an item has
> been exposed to less than ideal temperature and for more than a safe
> amount of time... would probably add no more than 2=A2 to the price of
> each package. With today's technology it would be extremely simple but
> you know that the food industry will fight it to the death.

They exist - I have seen them. The problem is stores will pull food
out of the coolers and let it sit - and so they would be setting off
the sensors and couldn't sell the product afterward. So it hasn't been
put into use commerically.

-L.