Psychotricorder

A psychotricorder is a specialized type of tricorder augmented for psychological examination. It was a Starfleet scanner capable of establishing in detail what a person experienced in the previous 24-48 hours.

Background
The device is the size of a TV set and could be operated only by a qualified expert in a distraction-free environment. Federation law required that the subject agree to the scan. 

It was a portable device used for field work. Aboard a starship, a psychoscan would be used instead. 

The device was not commercially available to the public. 

History
The psychotricorder was introduced circa 2265, and was believed to be unique among the races of the known galaxy. 

In 2267, Lieutenant Karen Tracy began a recursive memory scan of Montgomery Scott with a psychotricorder at the home of Prefect Jaris on Argelius II. She was murdered by Redjac before she could complete it. 

In 2270, when miner Jack Katz was accused of murdering a Horta and fellow miner Louis Handy on Janus VI, the crew of the USS Enterprise (NCC-1701) were obligated to employ other methods to determine the truth of the matter. A psychotricorder was forbidden as an investigative tool for criminal matters under the Pergium Production Station's charter. 

In 2270, USS Enterprise psychohistorian Ensign Weinberg joined a landing party preparing to beam down to Muldoon. Being inexperienced and not knowing what to expect, he reported to the transporter room with a psychotricorder, universal translator, tricorder and medical tricorder. (SS TOS (The Business, As Usual, During Altercations))

Qualified operators

 * Krisp
 * Karen Tracy
 * Weinberg