Originally Posted by
usud
Where are you flying from? To where? And why do you want to avoid the scan?
There are plenty of good reasons to want to avoid it. Potentially hazardous, invasive of privacy, slow, etc.
Yes you can opt out - but that will slow you down by 5 minutes or more (in SEA one time it took them about 10 minutes to find some guy to give me my full body massage - I suspect this is intentional)
It is fairly possible to avoid the body scanners at BOS. At least in terminal B (have barely flown through the others, so I don't remember). My memory is that you could just look ahead and see which lines were the body scanner lines. Occasionally the TSA agents will grab people out of the x-ray lines for a full body scan - but it's uncommon.