Janitor Found Dead

Riddle: On the first day of school the janitor was found dead. They chose 4 suspects, the gardener, the P.E teacher, the math teacher, and even the school principal. But, they all had reasons they didn't murder him. The gardener said he was cutting weeds, the P.E teacher said he was playing basketball, the math teacher said he was giving a mid-year test, and the principal was in his office. Right as the police heard this, they arrested one of the suspects. Why was that so?

Answer: The math teacher said he was giving a mid-year test while it was just the beginning of the year.

Source: https://www.riddles.com/5980

On the first day of school the janitor was found dead. They chose 4 suspects, the gardener, the P.E teacher, the math teacher, and even the school principal. But, they all had reasons they didn't murder him. The gardener said he was cutting weeds, the P.E teacher said he was playing basketball, the math teacher said he was giving a mid-year test, and the principal was in his office. Right as the police heard this, they arrested one of the suspects. Why was that so? — Janitor Found Dead by Grayson Brust v1.

Riddle: On the first day of school the janitor was found dead. They chose 4 suspects, the gardener, the P.E teacher, the math teacher, and even the school principal. But, they all had reasons they didn't murder him. The gardener said he was cutting weeds, the P.E teacher said he was playing basketball, the math teacher said he was giving a mid-year test, and the principal was in his office. Right as the police heard this, they arrested one of the suspects. Why was that so? Answer: The math teacher said he was giving a mid-year test while it was just the beginning of the year. — by Grayson Brust v2.