FILE No.180Unsolved
At 9:10 p.m., there was a theft at an office. The suspect claims, "I was at home all night."
The transit IC card on the suspect's smartphone had a record of entering a ticket gate at a station near the scene at 9:05 p.m. This IC can be used only with the owner's fingerprint authentication, and the suspect says, "I haven't lent it to anyone, and I have never lost it."
What can be said for certain from this?
If you get stuck, open the hints one at a time, in order.
Who used the IC?
What does the record show?
Compare the claim with the record.
What can be said for certain from this?
Choose the answer closest to the truth.
The claim "I was home all night" does not match the facts
The answer is "The claim 'I was home all night' does not match the facts."
If it can be used only with his own fingerprint and he has not lent it, the one who went through the gate of the station near the scene at 9:05 p.m. must be the suspect himself. His claim and the facts contradict.
We cannot go as far as "he is the culprit." There is no basis for thinking the record is wrong, and an entry record is not necessarily proof of having boarded a train (he may have entered and not boarded).
Because you leap to "record = culprit."
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