I struggled interpreting this one until I noticed the 'or'. '...an imminent threat or a crime in progress'. The word 'and' is inclusive, including both the term before and after. The word 'or' is exclusive. This means he's saying drones could be used if a crime were in progress but there weren't an imminent threat. The simple use of the word 'or' in that situation takes out Miranda rights, a right to a trial, and puts us squarely in a Judge Dredd execute on the spot scenario.