This reminds me of an old Columbo episode. Columbo had no evidence that the suspect was guilty, but he convinced the suspect that the fingernail clippings Columbo was collecting from him would match the scratch marks left on the victim.
The suspect fell for the junk science and confessed to the murder, just to find-out that if he was to have clipped or chewed his fingernails, the scratch patterns wouldn't have matched. (just because it sounds feasable, doesn't make it so)

I think it's likely the same thing here. Different growth habits, compacted buds versus loosely pack buds, (chewing his nails) nutrient variations, soil versus hydro, wind, humidity, length of seed maturation, post harvest handling...all play a part in seed appearance. I could see there possibly being differences in appearance between a Mekong Delta indica and a South American sativa seed, but with all the crosses, back crosses, and general mishandling of genetics, I sincerely doubt there is a pattern. And if I'm not mistaken, seed expression is along the same variety as plant expression. Some seeds cary-on some of the mother's traits, some cary-on the fathers traits, some with various combinations of both.

Would be way cool if it is valid, but I wouldn't hold my breath. :jointsmile:

Any chance you could post the link? Would love to read a bit more about this "observation", and how they worked-out that the concerns I listed were invalid. If they didn't even bother to investigate this, I think the source is...untrustworthy. (or at the very least, they're blowin' smoke up our collective asses)