Can You Solve This Murder Mystery?


First Day of School
On the first day of school a young girl was found murdered. Police suspected four of the male teachers and questioned each of them individually. All four men were asked what they were doing at 8:00 in the morning.
Mr. Smith: I was driving to school and I was late.
Mr. George: I was checking English exam papers.
Mr. Ford: I was reading the newspaper.
Mr. Thomas: I was with my wife in my office.
The police arrested the killer based on these statements. How did the police find the murderer?
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Answer:
Mr. George is the murderer. He would not be checking exam papers on the first day of school.