Okay, let's make this assumption. Persons A, B, and C are friends. Person A gets a bunch of Ecstasy, and sells (not gives) some to persons A and B. Persons B and C go to a party, are caught with pills on them by police, and now face whatever charges are appropriate. The police, wanting more information on how they got a hold of Ecstasy, offer a reduced punishment if Persons B and C tell the police about Person A, the supplier. With this in mind, and assuming that Persons B and C do tell the police about Person A, what sort of action can the police now take against Person A? Can they immediately issue a search warrant based on the testimony of Persons B and C? What sorts of things can the police do exactly?