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I'm not sure if this riddle has been posted here before, but this is an old (not too great) riddle I've heard a long time ago:

One hot summer weekend there was an emergency call to the police that a crime has been committed, Someone has been murdered at the park! The only lead the police have from their live footage feed was that the perpetrator was covered in blood and what car they used to drive away in. They now know the car model and colour, but nothing more about the murderer or car! The police begin searching around the city for this car and one officer finds a house with a car on the drive way that matches the same model and colour.

The officer goes to the house and asks to speak to the car owner about the event. After questioning the car owner, the owner said they were at home all day and that no one has used their car all weekend. The officer asks the car owner if they could search the car to confirm their story, the owner gladly agrees and hands over the keys. The officer begins searching, looking for possible weapons or any traces of blood (since the perpetrator was covered in it). The officer finds nothing related to the crime, and not even anything incriminating (i.e drugs, weapons). The car was spotless. However after finishing the search, and some thinking, the car owner is arrested!

At the police station the owner pleads guilty to their crime of the murder.

How did the police officer know the owner was guilty?

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The official answer is:

The car must have been moved and quite possibly washed because although it is a hot summer day the car is not roasting inside.

Rationale:

Had the car been sitting in the sun all weekend, it would be very warm inside: since it is not, the officer concludes that someone must have been driving it around with the windows open, using air conditioning or at the very least doing something that involved keeping the car open long enough for it to cool down (e.g. scrubbing blood off the seats).
This is in contrast with the claims made that no one's been using the car.

..although my favourite is:

the owner is covered in blood ^^

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  • $\begingroup$ My intended answer was your first answer, could you please add the extra little bit of information to it to explain how. $\endgroup$ – Mark N May 26 '15 at 17:43
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The motor was still hot so the police officer knew the guy was lying when he said that nobody used the car.

It's kind of lateral thinking, it could be a lot of differents things like:

-It rained that day but there was no trace of rain on the car
-The car got a speeding ticket that day

The answer of tfitzger works as well.

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  • $\begingroup$ Close, but not exactly right. $\endgroup$ – Mark N May 26 '15 at 17:26
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My guess:

There was some receipt or other indicator in the car that said that it had been used over the weekend, contrary to the owner's story. This made the officer suspicious, even though it wasn't directly linked to the crime.

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  • $\begingroup$ Close, but not exactly right. $\endgroup$ – Mark N May 26 '15 at 17:26

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