Start replacing their drinking water with heavy water, increasing the ratio gradually over a fortnight.
The only symptoms that will show will be being increasingly lethargic and run down, which could be anything. An autopsy result, unless tested for chemicals, will show nothing.
( Maladicta, Tue 14 Jul 2009, 14:52, 1 reply, 16 years ago)

C'mon...
If they've died from "no real reason other than lethargy", the first thing that'll be tested for on the corpse will be "chemicals".
( Cawl, Tue 14 Jul 2009, 14:54, Reply)

OK, I've not really thought this through...
it seemed pretty flawless when I read it.
( Maladicta, Tue 14 Jul 2009, 14:56, Reply)

Also, heavy water is pretty difficult to get hold of

(Bazongaloid, Tue 14 Jul 2009, 14:57, Reply)

Befriend your local nuclear facility.
And hope their security's lax...
( Maladicta, Tue 14 Jul 2009, 14:58, Reply)

You could apply the same logic to any poison.
Of course it's gonna be checked for.

news.bbc.co.uk/1/hi/england/lancashire/8147691.stm
www.bbc.co.uk/crimewatch/solved/howtheycaught/pasta_poisoner.shtml
news.bbc.co.uk/1/hi/england/gloucestershire/8134463.stm
( Cawl, Tue 14 Jul 2009, 14:58, Reply)

I need to stop reading books that aren't plausible.
I read this when I was 13 and it's stuck with me ever since...
( Maladicta, Tue 14 Jul 2009, 15:00, Reply)