BWI security lines have always been long, but now with the liquid ban, mandatory shoe removal and short staffing they are very slow. I flew out of the D concourse about a month ago and only two lanes out of eight or so were open, at a busy time. Took at least 40 minutes from the back of the line to the time I was on the concourse.
The same lady as MileageAddict described in his previous post was there checking IDs (she looked pregnant to me, so maybe that's why she didn't move off her stool).