https://www.newscientist.com/article/2245361-crops-sprayed-with-barcoded-spores-could-help-trace-food-poisoning/ https://www.newscientist.com/article/2245361-cr

https://www.newscientist.com/article/2245361-crops-sprayed-with-barcoded-spores-could-help-trace-food-poisoning/ https://www.newscientist.com/article/2245361-crops-sprayed-w... "Crops sprayed with 'barcoded' spores could help trace food poisoning...." Spores are tough.