Possible Clues:

• Proofs accused was elsewhere at time of crime
• ''The dog ate my homework'' and the like
• All goes to show that they're not all there
• Defences of being elsewhere at the time of a crime
• Suspect stories
• Means of exoneration
• 'I was home asleep at the time of the murder' and others
• Stories on the stand
• A learner, one getting second grade, is offering excuses
• Suspects' excuses