In Fort joy I did the usual thievery trick of sneaking behind the vendor and steal his stuff and dropping them on the ground. When they approach me they cannot find the stolen items in my inventory and I'm off free.
But when I got to Sanctuary of Amadia and try to steal and drop the stolen goods on the ground every vendor will say that I'm caught so I have to bribe them to avoid a fight. I tried to drop all the previous stolen items from other vendors too but I didnt help.
Is there any item/action that will automatically make the vendors think I'm a thief?