Covert

There are several types of covert investigations. Some depend on a person who does not appear to be an interrogator teasing information from the subject while he's unaware that he's being questioned.

One is the fake employment candidate. During interviews, candidates wait in an anteroom to be called. One returns from the 'interview,' sits down next to another and says: 'Boy, that was rough! They asked me if I used drugs.I didn't admit anything. Are you going to tell them?'...

Another type of covert interrogator is the fake friend or sympathizer. The person, who may be an acquaintance, fellow employee, or neighbor, sidles up to you and tries to get you to reveal information useful to the investigation. By pretending sympathy, this type of interrogator can break down the barriers that people normally have, and obtain damaging information.

The undercover cellmate is another variant on the theme. A police officer poses as a suspect, and gets to share a cell with you. Like the genuine criminal cellmate who trades information for deals, the undercover officer will pump you for information. The chances of this happening in the future are greater, now that a court decision (Illinois vs. Perkins) had ruled that it's not necessary for an undercover police officer to give a suspect a 'Miranda' warning under such circumstances. The decision went on to explain that, although 'Miranda' prohibits coercion, it allows deceiving a suspect by use of a fake prisoner. The suspect is not protected against the consequences of boasting about his crimes to people he thinks are fellow felons."

This is what Jack said.