Thank you for those comments, Isaiah. I just returned from Kenya last night. I agree that it would be great if we can help protect the safety of each crop/product, at each step along the value chain. My thinking is that if we can raise awareness by providing access to citizen monitoring at the end of a key value chain (maize, the #1 staple), then people will be better at taking care of the issues along the way, and with their other foods. That is, maize consumers will start noticing the issues, and this will drive concern for quality along the process, since they will demand clean food to each. We could encourage and support sorting with displays that raise awareness of the full diversity of issues, such as those that you raise.
Regarding cost: our current blower costs ~$120, and the sorter itself is probably around the same cost. We're still actively working on designs and options. Maybe we can come up with a gravity table that's powered by the posho mill itself (using a belt from the same motor) to reduce the additional cost to the miller for establishing the technology. Suggestions welcome, of course!
Thanks for your comment, William. I agree that mycotoxins should be managed as well as possible across the entire value chain. For many people in SSA, the value chain is pretty short: from the farm to the local hammer mill and then the cooking pot (sometimes with local trade in between). People bring small amounts of grain (typically 2-9 kg) to their local hammer mill to process the week's food. So there's not too much storage time after the sorting and milling that we propose.