The rarity of high technology means that memories from the past often blaze a trail of death, leaving chaos in their wake.
As a SPECTRA agent, Violet has the power to do anything necessary to confiscate or destroy ancient tech. But, to do that requires careful investigation. Violet can investigate certain areas for clues, which are added to the evidence file.
The discovered clues are later used in interrogations.
Sometimes, suspects know things they aren't willing to give up without a fight. In an interrogation, Violet can use either her evidence, or her psychic powers of emotion reading to uncover the truth.
After questioning the suspect, the player must "present" a piece of evidence, or "doubt" an emotion that directly contradicts a suspect's statement to catch them out on their lies.
Later on, there may be even more things that come into play...