The last four times we've transited Doha going or coming from Goa we've always had to go through the carry on of going through the very crowded security, and it usually means that you miss the Duty Free as it's , without exception, very crowded, with long queues. I think the only time they whisk you through, is if your flight is late and time is limited. This of course, begs the question, that if they can overlook it then, why not always. It's doubly annoying for us as my wife has a pacemaker, and cant go through the metal detector, invariably, she has to wait till they russle up a female to search her, often in a closed booth, they then find her knee replacement which sets of the hand held scanner, sometimes causes more hold ups. Not sure how many white 70+ bombers are around, not too many I suspect. Invariabley her searching going through Doha, is far more stringent that that applied to the run of the mill passenger, and as a result, no visit to the duty free.
Alan