||While the question may seem simple, unfortunately there's no clear answer. We are unaware of anyone who has been prosecuted for ingesting Morning Glory Seeds. This doesn't mean it couldn't happen, but it's certainly uncommon.|
The sale or distribution of the seeds for the explicit purpose of ingestion is a different question. Again, we are unaware of anyone who has been prosecuted in such a case, but it seems somewhat more plausible that it would/could happen, especially in the case of an individual or organization who was selling large quantities or to a large number of people.
The closer one gets to the explicit sale or distribution of the seeds as a drug, the more likely a court would be to find that action illegal. And as you probably know, the extraction of LSA from the seeds would also be a significant step towards illegality, especially if done in large quantities.
I know this isn't a definitive answer, but unfortunately there are no definitive answers in these cases. In a case such as the one you describe it seems relatively unlikely that the individuals who ingested the seeds would be prosecuted for possession of a Schedule III substance (LSA) and somewhat more possible that those distributing might face some sort of legal repercussion.
We'd be interested to hear if anyone involved IS prosecuted. Good luck.