Smart plants that turn red when their roots reach explosives have been around for close to twenty years. Why have they not succeeded? Near as I can tell the D

Smart plants that turn red when their roots reach explosives have been around for close to twenty years. Why have they not succeeded? Near as I can tell the Danish company that launched them experienced huge pushback because they were GMO's and this was the height of anti-GMO hysteria in Europe. The charities that would fund distribution wanted nothing to do with GMO plants - even if they saved lives. I found one study that said the rats were more cost effective. The seeds had to be flown over the field and a great number of them refused to germinate. Years later grass started being seeded with a moist paper mulch that contained a small amount of fertilizer. Would it work with these seeds? Far as I can tell the Danish company abandoned development of the product. https://commons.wikimedia.org/wiki/File:Plants_that_change_color_and_mark_buried_explosives.jpg https://commons.wikimedia.org/wiki/File:Plants_that_change_c...