Posie: Least said soonest mended would have been the best approach, but to break the total silence (shock and disbelief) that followed the words, DH said something along the lines of, "I promise you, he hasn't got that from us!". I don't think the PC was convinced, but no more was said about it! Even though I knew what had led up to DS's words, I was far too shy back then to try and explain to a policeman.
(Just in case anyone is wondering why the policeman was there, I should explain that my OH had been attacked on the towpath outside our boat the evening before, and the PC was there to get some details.)