Strange characters indicate which colleague is the culprit?

Question 1: Programmer Kevin is murdered in his office. The killer rummaged through the room to steal the computer software Kevin wrote down. The only clues at the scene were a few strange characters written in the victim’s diary. The police questioned three suspicious colleagues.

Ben said he wasn’t feeling well, so he stayed home on the day of the murder. Sam made an appointment to meet Kevin after work, but Kevin didn’t show up. Dan said he and his wife went to visit relatives.

Based on clues and testimony, can you guess who the killer is?

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Verse 2: Detective Allen is tracking a drug dealer to find out how he delivers goods to customers. Allen saw the criminal walk into the cafe, hanging his hat on the rack. Another man entered later, also took off his hat and sat down at the table, looking nothing suspicious. The man finished his coffee and got up to leave. But as soon as he took up his hat, the detective pointed his gun at both of them, announcing their arrest.

What clues did the detective discover?

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Question 3: Mike’s car was intentionally set on fire by someone. Mike was sure it was a member of the Smith family – the neighbor had a grudge against him. Police asked the three Smiths what they were up to yesterday.

Mr. Smith said it took all day to clean the fireplace, Mrs. Smith went to see a friend, Kelly had an appointment at the cafe. Who is lying?

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Question 4: James informed the police that his wife was attacked while camping in the woods. When the police arrived at the scene, James said, they had just finished setting up the tent when it started to rain, he rushed into the forest to find some firewood to make a fire. When he returned to the tent, he found his wife unconscious on the ground.

However, the police believed that James made a false statement and arrested him. Why?

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According to 7-second riddles