Ezy Street...... with regard to the alarm system, there would be a general pattern as to when the alarm is activated either way, on a day to day basis.
To show that the alarm was suddenly disarmed into the early hours of the morning before it was activated if at all, would show a discrepancy of household security behaviour. Hence he elected to go for the 'faulty story' when quizzed and obviously by the time the police got around to taking a closer look at the situation, all records had been deleted.
Just my spin on that part of the puzzle.
To show that the alarm was suddenly disarmed into the early hours of the morning before it was activated if at all, would show a discrepancy of household security behaviour. Hence he elected to go for the 'faulty story' when quizzed and obviously by the time the police got around to taking a closer look at the situation, all records had been deleted.
Just my spin on that part of the puzzle.