Again, there are many variables when it comes to detection. Some will, some won't, some might. Always be prepared for the detector to alarm and you'll be fine. I've been patted down more than most career criminals over the years - mostly at work where we had to go through a TSA type security every time we entered the plant protected area.
I think we've drifted a bit in this thread (I'm guilty). Let's move on from the metal detector anecdotal stories and back to the original topics.