[the OlLine Rebel]

Uh, I seriously doubt it’s “much easier and more accurate”.

What’s easier than just someone eating something within an hour of you? Just how many tests can be performed on various food and what do they have to do to it in the process? How long does it take (hours I’m sure) to do these tests including chemical/bio checks, especially if you don’t know just what you’re looking for?

Sounds astronomically expensive to me, if nothing else.

[Harmless Teddy Bear]

Actually it takes very little time.

The machine knows what should be in a certain dish and notifies you if something else is in it.

Human food tasters are really easy to get around.

[Hiddigeigei]

Sounds astronomically expensive to me, if nothing else.
I imagine some sort of photo spectrometry would catch unusual peaks in a food sample with a couple of minutes preparation on a machine costing a couple of thousand, but would only analyze that part of the food sampled; just as a food taster would only react to the part of the meal tasted.