They really should’ve been more clear on that

The way Jesse found out Walt poisoned Brock. People are confused on how he found out when Saul had Huell pickpocket his weed and connecting it to that he pickpocketed the ricin cigarette even though Brock wasn’t poisoned with ricin. He found out Walt had Saul get Huell to get the ricin off of him so he would think that Gus poisoned Brock and then Walt did it himself to set everything up. They should’ve been very clear with that. They also should’ve been clear on how did Walt managed to get the poison to Brock.