Personally, I found the depression before, during, after question OK. I answered it in the context of some kind of time limit, ie. a few days before, a few days after. I do think it would have been better if this was defined in the survey - so everyone was working with the same time frame. So I thought, to what extent am I depressed in the lead-up to, during, and in the few days after ecstasy use? I guess this would be more of a problem to answer if you are clinically depressed anyway (thus answering yes not due to drug use, but due to normal disposition). However this can be factored into the analysis because a question was also asked (at the beginning) about current levels of depression).