This posting is not meant to open a new debate on the subject, but merely to inform players what the DM's have agreed is appropriate for this very sensitive subject.
This does not imply that all DM's are of one mind on what consequences would be for any given warlock should they be ID'ed, or that PC's are expected to react in any predetermined way.Warlock magic can be ID'ed if the casting is witnessed by another PC or NPC who successfully makes a spellcheck vs 15 + warlock spell level.
What the PC or NPC may learn of this successful ID is only the basic knowledge of what the spell is. and that it was cast by a warlock.
Any additional insight into the warlock class would require ranks in arcana + rolls or personal knowledge by the ID'ing PC or NPC gained IC.
An unmodified Eldritch Blast is treated as a level 1 spell regardless of what level the warlock is that is casting it.
DM's each have their own perspective on appropriate reactions of various NPC's, and PC's each have their own personal views.
This is merely a statement of what is expected to complete an IC ID.
Please do not assume the game engine is capable of handling IC ID's automatically...it isn't.
Die rolls and personal observation are required.