Symptoms of arsenic poisoning can take eight to 14 years to manifest in a person.

CNN: Filter cleans arsenic-tainted water

Other senior ministers have suggested that the arsenic poisoning may have been self-inflicted.

ECONOMIST: Malaysia

But subsequent medical tests cleared him of any acute or chronic arsenic poisoning.

CNN: All Over But the Verdict

When we think of the problems that plague the globe, arsenic poisoning is not one that springs readily to mind.

FORBES: "Plastic Bottle" Filters Can Help Millions Poisoned by Arsenic-Contaminated Water

The cause of death was arsenic poisoning and an autopsy found trace amounts of strychnine and other chemicals in his body.

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Apart from disfiguring the skin, after two decades arsenic poisoning has a high risk of causing fatal cancer in the lungs, liver, bladder and kidneys.

ECONOMIST: Scientists have offered a solution to the arsenic wells

Cynthia was accused of poisoning him with arsenic.

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The Swiss team say the presence of arsenic in Napoleon's hair, the source of the poisoning theory, was linked to this enthusiasm for wine.

BBC: RELATED BBC SITES

Some well water contains so much arsenic that an adult drinking four litres a day could start to show signs of poisoning.

BBC: By Helen Sewell of BBC Science

Backers of Professor Islam's filter hope that the publicity that it receives at the Arsenic conference in San Diego will help raise funds to end arsenic contamination in Bangladesh, described by the World Health Organization as the largest mass poisoning in human history.

BBC: Water filter set to save lives