I've flown through 4 different UK airports in the past 6 weeks. Each had them installed, but nowhere seemed to be using them. The only place I've had to go through one was (surprise, surprise) in the USA.
In Miami? I have no idea if it was optional, but the impression given by the security staff was that it was not an option. As it didn't really bother me, and I was running late for my connecting flight, I didn't ask.
Whether or not you are flying for Thanksgiving, if a TSA agent directs you to a whole body imaging (WBI) unit, politely but firmly say, “I opt out.” If you are asked to move into a back room, say, "No, I'd like this to be done in public, please." Be sure to keep an eye on your property, especially if it is already moving through the traditional belt scanner and you are being moved to another part of the screening area. The ACLU's Know Your Options at the Airport has a lot more information about your options and includes topics like asking to take a witness with you for a private pat-down.
Q. Is imaging technology optional? A. Yes, imaging technology screening is optional for all passengers. Passengers who do not wish to receive imagining technology screening will receive alternative screening, including a physical pat-down.
Interesting that it is optional in the US. I just assumed they would make it compulsory.
I'll bear it in mind, not that I fly through the US very often. I try to avoid it at all costs as they don't allow transit passengers, so you have to go through the full immigration process even if you are just catching a connecting flight. 4 hours is the longest queue I've had to wait in. Anyway, that's another rant.
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Well, not going to America any time soon.
Any info on if/when UK is going to roll them out in every airport?
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From here:
From here
More information available here and here
Those are all just for America though – I've read suggestions from various places that it might not be optional in other places, such as the UK.
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I'll bear it in mind, not that I fly through the US very often. I try to avoid it at all costs as they don't allow transit passengers, so you have to go through the full immigration process even if you are just catching a connecting flight. 4 hours is the longest queue I've had to wait in. Anyway, that's another rant.
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http://blogs.crikey.com.au/planetalking/2010/11/19/official-no-sexual-feelings-at-australian-airports/