Postcognition is the ability to see past events using your psychic sense. A psychic detective who helps the police solve crimes are most commonly to use this ability along side psychomentry. This ability is the opposite to precognition. A technique of training this is: Pick an unfamiliar picture. Use remote viewing to know the full surroundings of where the picture was taken and then repeat the event as if it was a recorder video tape.
Like precognition, postcognition can sometimes just happen unexpected. Like you're alone or in a quiet room and suddenly you get visions of a car crash which happen about a day ago or you may get a vision of a brutal murder or anything really.

i can tap into post cognition when i use psychomentry its rather interesting

Me too.

Indeed it is nf. It also makes sense. When psychic detective investigates a murder weapon of a crime scene and use psychomentry they mostly need to know what happen so they use retrocognition/postcognition.

Cool.