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A Color They Shouldn't Know (illustration)
FILE No.102Unsolved

A Color They Shouldn't Know

Difficulty ★☆☆about 5 minTheft CaseSlips that revealTestimony
The news said only that "jewels were stolen." The suspect said, "That blue jewel must have been expensive." What should police check first?

Case Record

Jewels were stolen from a jewelry store. The news reported only that "jewels were stolen." Neither the police nor the media have released the colors or types of the jewels. Only the police have confirmed that a blue jewel was among those taken. The store had jewels in blue, red, green, white, and other colors.

Questioned by police, a suspect said, "That blue jewel must have been expensive." The suspect has never been inside the store and has never seen the jewels in person.

Your question

Based on this remark, what should the police check first?

Case Files

Diagram

Who knows about the "blue jewel"?WhoWhat they knowThe newsOnly "jewels were stolen" (colors and types notreleased)The policeA blue jewel was among them (known only to thepolice)The suspectNever entered the store, never saw the jewelsThe suspect said: "That blue jewel must have been expensive."
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Had the colors been made public?

Open hint 2

Has the suspect ever seen the jewels?

Open hint 3

What would you learn if you knew how the suspect found out the color?

Solve It

Your question

Based on this remark, what should the police check first?

Choose the answer closest to the truth.

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The Truth

When, from whom, and where the suspect learned the color of the blue jewel

The answer is "When, from whom, and where the suspect learned the color of the blue jewel."

The colors have not been made public. The suspect has never been in the store and has not seen the jewels. Yet the suspect said "blue jewel." It could have been a coincidence, but the first thing to check is where the suspect learned that color.

Looking into the suspect's tastes or knowledge of prices would not explain how the color became known. This remark alone does not prove the suspect is the culprit.

What to check firstThe color was never releasedThe suspect never entered the storeYet the suspect said "blue"When, from whom and where did the suspect learn it?Note: this remark alone does not prove guilt. It could be a coincidence.
Diagram of the solution

Key Points

  • Focus on information that was not public
  • Check how the information was obtained
  • Do not jump to calling the suspect the culprit

Why people get fooled

Because a slip of the tongue is easy to let pass.

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