Could even be a snack they shared if they travelled in the same vehicle to and from the lunch.
Those people went to hospital feeling pretty ill and with symptoms of poisoning.
Stool and urine and blood samples would be taken as a matter of routine.
They should be present in those..
They were hospitalised within 36 hrs of the lunch from what I am gathering from unreliable media.. Amanita is present if it is. I put a link up on diagnostic tests available and routinely used in Aus, yesterday. It's not a complicated test..
BUT I remember doing research on other highly toxic mushrooms a few threads back, some are strikingly similar in the symptoms they produce.
It's impossible to guess at it.
The victims would have had liver and renal function monitored constantly which would show poisoning progressive damage despite their best efforts to save them.
She allegedly provided a sample of leftover lunch for further examination, possibly while they were hospitalised but before they died.
I don't have a clue what their bio tests or the tests of her food yielded.
It's a mystery.
All of it.
Strychnine, for example goes like this
Learn more about strychnine and what to do if you are exposed.
emergency.cdc.gov