Jason Sparks is an Oklahoma man who almost single-handedly created the distillate that led to Missouri regulators’ decision to pull more than 60,000 marijuana products off the shelves in August and revoke the license of Robertsville-based Delta Extraction.

Now, he’s the star witness in a hearing scheduled to begin Monday morning, where Delta will try to convince the Administrative Hearing Commission to reverse its license revocation and allow it to sell its product in Missouri.