It seems that the accused is a Maths teacher .................. I can't help wondering how long it took before a copper at the crime scene turned to his mate and said "You know Sarge ~ This just doesn't add up"
If it took longer then 30 seconds after the arrest I'd be surprised. One thing I remember about police/paramedics/doctors et al is that they all have a warped sense of humour to get through the daily grind.