Stan,

It is not that easy to tamper with food or water sources.

In urban areas, virtually everyone has a private borehall (that is enclosed with the gates of the compound). In rural areas, there is either a well or a stream/river.

Sad to say this, but if you kill a thousand people a day in rural areas. No one will bat an eyelid, what happens in the city is what counts, unfortunately.

As we speak, children (hundreds of them) are dead or are going to die due to lead poisoning from gold prospecting. Nobody is terribly bothered about that (http://en.wikipedia.org/wiki/Zamfara...oning_epidemic).

Even if a contaminated bag of cornflakes is put in a grocery store. How does one conclude that the deaths are attributable to poison in the cornflakes? Nigeria does not have a robust forensics team and deaths are more likely to be attributed to Juju.