I would also like to be able to send, say, an apple bought from the local farmer's market, to a lab, and get back results about its nutritional content. Then,

I would also like to be able to send, say, an apple bought from the local farmer's market, to a lab, and get back results about its nutritional content. Then, compare it to what the FDA says that apples should contain. Same for non-apple foodstuffs, of course. Also, testing for lead and other not-nice stuff would be good.