Entities, who will you encounter?

As a Medium/Paranormal Investigator you should know the difference between a residual and a live link. If you don’t then you shouldn’t be a medium, because you could be giving a reading to another and actually gaining all information on a psychic level rather than from a live/spirit link. At this point you would be classed a fraud as you are acting as a psychic and not a medium. If you are a medium on location, especially if you are the main medium and you don’t know the difference, you have no business being on any investigation. Let alone being in a position where your actions and reactions can cause a chain of events that can cause panic or even harm to others!
For the inexperienced less knowledgeable medium it is actually very understandable to confuse the two. You would use the same abilities to translate all information whether psychic or spirit communication. To the untrained, inexperienced medium this can get quite confusing. And so paranormal investigations is a great place to spread your wings as such and get a true grasp on the two, but always ensuring you are accompanied by an experienced and fully trained individual, preferable who has years of teaching others in this subject under their belt.