Legally the first part of the quandry should be clear. You would have to return the powder (as I'm assuming it didn't come with a label and so you'd only be guessing what it was) in the same way you would with anything else you discovered on the patients person. Ethically you would be breaching patient confidentiality by reporting it to the police, if you asked yourself why you were doing it the answer would probably be "spite" and that's far from a reasonable motive. Morality clearly contradicts both of the last two answers, however morality bears no relavence to your professional behaviour, that is governed by medical ethics and the law. Morality, oddly enough is something we seem to impose on others far more freely than we expect it of ourselves. At the end of the day 'Cleaning up the streets' is best left to Batman! DSO