Can confirm that field trials have been going on for several years in north Warks on different soil types and aspect and is well known by the local lads.
Fields used are normally away from roads but can be found from public footpaths , i know many farmers from shooting rabbits on their land and none will talk about this crop or the GM trials also going on.
On two fields have seen no plants the following year in the hedges and cover strips , crop was dessicated with glysophate or similar in mid september and combined for seed and cattle feed , same as oilseed rape , looks like they deep ploughed after and seeded for pasture.
Last year loads was being taken from fields and sold as weed to the unwary or mixed in with genuine bud to bulk it out , looked the part and had trichs but just gave you a migraine and a sore throat.
There is apparantly a good example adjoining the northern relief road in Hinkley that is fast becomeing a tourist attraction.
Wait wait wait....you think the super secret test fields of GM hemp grown by legitimate farmers are being stuffed into the sacks you purchase off the street to "bulk it out?"
You sir, might be insane.