Technical question on toxic and poisonous substances.

I’ve entered a story writing competition at my local university and have decided to write a murder mystery story. The idea for it revolves around someone who has been poisoned but the murderers alibi hinges on the fact that the poison which has been administered is very slow to work. Are there any toxic substances which, when administered, do not provoke any symptoms for about 4 days after ingestion? Any and all help is appreciated.

Cheers,

Gomez.

Thallium poisoning can take up to 4 months, plus it odorless and colorless!

Okay, this is from re-runs of Columbo (or some other show from the same time period): Evil dentist used time release medication in hollowed-out tooth. Like time release capsules.

Four days is a long time though. Anything you’d ingested would be absorbed into your system or else pooped out, wouldn’t it?

Tylenol?

Acrylamide is a potent neurotoxin.

It has to be administered at the right dose.

Delayed onset of symptoms may arise from its conversion to a more toxic substance (from metabolic processes).

This has been used before…

http://www.crime.co.nz/c-files.asp?ID=46