SUBJECT: Advanced Imaging Technology Equipment and Procedures
Background
ALPA’s president, Capt. John Prater, has had numerous high-level discussions
with DHS Secretary Janet Napolitano and TSA Administrator John Pistole over the
past several days concerning the issue of security screening and has made
specific, confidential recommendations on how it should be addressed. The
Association’s concerns have been heard and are being examined by the
Administration with the goal of finding acceptable solutions.
ALPA has urged the U.S. Government to cease subjecting flight crewmembers to
AIT screening protocols immediately. We are seeking near-term and long-term
relief for pilots from traditional checkpoint screening requirements because we
believe them to be unnecessary and ineffective as applied to flight crews.
ALPA’s highest security priority is an effective means of screening and access
to airport sterile areas commensurate with a pilot’s trustworthiness and
responsibilities. This document has been prepared to assist you in transiting
the screening checkpoint until ALPA is successful in obtaining an effective and
appropriate security checkpoint methodology befitting airline pilots.
Due to the recent deployment of Advanced Imaging Technology (AIT) at many
airport checkpoints, ALPA’s National Security Committee (NSC) and the
Association’s Aeromedical Committee and Aeromedical Office have collaborated to
provide ALPA members with specific information regarding the science, potential
health impacts and security protocols associated with AIT.
In March 2010, the TSA began deploying 450 AIT units in airports nationwide,
with an announced goal of deploying nearly 1,000 AIT machines by the end of
calendar year 2011. AIT is designed to screen for both metallic and non-metallic
threats, including weapons and explosives, without direct, physical contact.
Two different AIT technologies are in use at airports across the nation:
millimeter wave and backscatter x-ray. TSA describes those systems as follows:
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Millimeter Wave AIT – Millimeter wave AIT
uses non-ionizing radio frequency energy in the millimeter wave spectrum to
generate a three-dimensional image of the body based on the energy reflected
from the body. The image, which resembles a fuzzy photo negative with facial
features blurred for privacy, is displayed on a remote monitor for analysis
to determine whether potential threats are present.
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Backscatter X-ray AIT – Backscatter AIT
uses a narrow, low-energy x-ray beam that scans the surface of the body at a
high speed. The machine then generates an image resembling a chalk etching
with a privacy filter applied to the entire body. The image is displayed on
a remote monitor for analysis to determine whether objects are present.
TSA Views on AIT Health and Safety Issues
The TSA has declared AIT to be safe for all travelers. According to its
research, energy emitted by millimeter wave technology is thousands of times
less than what a cell phone is allowed to emit. TSA also has stated that the
amount of radiation from a backscatter scan is equivalent to two minutes of
flight on an airplane. On its website, (http://www.tsa.gov/approach/tech/ait/index.shtm),
TSA states, “Naturally occurring ionizing radiation is all around us. We are
continuously exposed to this background radiation. In 17 minutes of ordinary
living, a person receives more radiation from naturally occurring sources than
from one scan.”
TSA Perspective on AIT Privacy Issues
TSA states that it has implemented numerous measures to protect passenger
privacy, including:
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Signage which informs passengers of privacy
considerations
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Has made AIT screening optional
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Image officers are remotely located and do not
see the individual whose image they view
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Faces on AIT images are obscured by filters
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Images cannot be saved, transmitted, printed or
otherwise stored
More about TSA’s views on privacy are provided on its website at
http://www.tsa.gov/approach/tech/ait/privacy.shtm.
ALPA Views on AIT Health and Safety Issues
ALPA’s Aeromedical Committee earlier this year published a bulletin (i.e.,
the
March/April 2010
Aeromedical Flyer) on the potential health and safety
effects of AIT equipment as relates to airline pilots, who face repeated
exposures.
Two excerpts from the Aeromedical Flyer, the first on back-scatter
x-ray and the second on millimeter wave technology, are provided herewith:
Back-scatter x-ray
To calculate the maximum number of backscatter
X-ray scans that a flight crewmember could receive that would result in the
maximum annual occupational exposure limit, one would take the difference
between the highest estimated exposure from in-flight radiation exposure and the
maximum recommended exposure for occupationally exposed individuals. The
resulting difference is 10.9 millisieverts per year. In order for a crewmember
to receive 10.9 millisieverts of radiation from backscatter X-ray scans, he or
she would have to be subjected to 218,000 scans per year, which equates to an
average of 699 scans per day (calculated over a 6-day work week, 52 weeks per
year). Given the number of scans that would be required to reach this limit, it
is a safe assumption that this limit is unachievable even by the most active
crewmember. While these limits apply to occupationally exposed individuals, one
needs to keep in mind that limits for occupational workers who are pregnant are
subject to different recommendations. Current recommendation set forth by the
ICRP for pregnant workers is 1 millisievert over the course of a pregnancy.
Given these limits, full body scans could pose different challenges for pregnant
crewmembers, which is beyond the scope of this article.
Millimeter wave
Millimeter wave technology creates a
three-dimensional image of the body, revealing concealed objects beneath
clothing. Electromagnetic radiation in the high radio frequency (terahertz) band
is transmitted simultaneously by two coils or antennas which rotate around the
body during the scan procedure. Although the technology employs electromagnetic
radiation, the type of radiation associated with this scan is classified as
non-ionizing radiation. The electromagnetic wave that is reflected from the body
surface is processed to form a three-dimensional image of the body surface.
While the electromagnetic radiation is not considered ionizing, researchers are
currently investigating the health effects of terahertz radiation exposure. The
American College of Radiology (ACR) released a position statement in January
2010, citing that the technologies associated with both scanning modalities is
not considered to present significant biological effects for passengers
screened. Results from research conducted at Los Alamos National Laboratory
suggests that terahertz radiation exposure may affect DNA dynamics, impacting
processes associated with gene expression and DNA replication. Current position
statements by national organizations suggest that the risk associated with such
scans may not significantly increase risk to adverse health effects. Further
research may be warranted to investigate the proposed risk suggested in
preliminary studies, especially given that debate still exists over the safety
of this form of imaging technology.
Dr. Quay Snyder, ALPA’s Aeromedical Advisor, makes the following statements
regarding repeated AIT exposures for pilots:
ALPA’s Aeromedical Committee is actively studying
TSA’s Advanced Imaging Technology (AIT) and its potential effects on pilots who
face repeated exposures. The March/April 2010 Aeromedical Flyer offers an
excellent synopsis of the current science and relative risks associated with
this technology. The equipment used in AIT meets scientific recommendations for
radiation exposure for the general public even when considering the multiple
exposures pilots face over a career. The backscatter screening technology
provides a very small contribution to a pilot’s annual total ionizing radiation
dose. Although the science on very low dose radiation exposure has not shown a
causal relationship with cancer or other diseases, no amount of ionizing
radiation should be considered completely safe in the absence of scientific
evidence. Pilots should minimize their exposures to ionizing radiation in both
non-occupational and occupational settings.
Millimeter wave AIT does not utilize ionizing
radiation as does the backscatter technique, which has been shown to pose a
health risk in moderate to high dosages. The millimeter wave technology uses
electromagnetic radiation, which is under study and the subject of debates
similar to those related to questions whether cell phones potentially cause
brain tumors or living near a high power line causes birth defects and other
diseases. No evidence exists, but the issue is still under study.
TSA Policy On the Use of AIT and Pat-down Procedures
An individual who presents himself or herself for checkpoint screening will
be directed by a Transportation Security Officer (TSO) to pass through either a
walk-through metal detector (WTMD) or an AIT portal. TSA policy permits
individuals to refuse to be screened by any technology deployed at airport
checkpoints, including the AIT, WTMD and baggage x-ray for carry-on luggage, and
request a private physical screening. An individual who refuses to be screened
by a particular technology does not have the right to choose an alternative,
preferred technology.
If an individual refuses to use a particular checkpoint screening technology
such as WTMD or AIT, the TSA will use standard pat-down procedures by a
same sex-screener as the primary method of search (as opposed to a hand-wand
search). Standard pat-downs are conducted with the palm of a screener’s hand,
except for more sensitive areas of the body (i.e., groin or breasts), where the
back of the hand is used. During any alarm resolution, resolution
pat-down searches may include a more aggressive touching of the individual’s
body in the suspect area with the palms of the hand, except for the groin and
breast areas, which will be conducted with the back of the screener’s hand.
Following any pat-down search, the hands of the TSO will be tested for residue
by explosive trace detection (ETD) equipment.
An individual can be subjected to checkpoint pat-down search for a number of
reasons:
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Opting not to submit to AIT or WTMD
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An unresolved alarm after submitting to either AIT or WTMD
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Random selection
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Designation as a “selectee”
Withdrawal from Screening Process
According to TSA, once an individual presents himself or herself for airport
checkpoint screening (i.e., submits to the process of an administrative search),
he or she cannot withdraw from the process before its completion without risk of
exposure to a TSA investigative process and/or local law enforcement action. The
agency cites U.S. v. Aukai, U.S. Court of Appeals, 9th circuit, 2007.
Recommendations
The TSA does not currently differentiate between passengers and crewmembers
regarding the use of AIT at airport checkpoints. ALPA categorically objects to
this policy and is currently engaging government policy makers to bring
short-term and long-term relief from this process to all flight crewmembers.
As we pursue that effort, we offer our membership the following guidance:
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TSA permits you to opt out of AIT screening. If
you do so, you will be required to submit to a pat-down screening which you
may find invasive of your privacy.
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Maintain a professional demeanor at all times, as
your actions are on public display and are likely being video-recorded
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If selected for pat-down screening, request a
private search. Note: ALPA has made an inquiry of the TSA to determine if
they will permit a pilot to have a witness with them during pat-down
searches. The answer to that question will be relayed to the membership upon
receipt.
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If you encounter suspected unprofessional and/or
inappropriate behavior by checkpoint screeners, file reports with the TSA
checkpoint supervisor, your chief pilot’s office, and your MEC Security
Committee Chairman/Coordinator
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Be aware that your Ground Security Coordinator
will not be able to aid you in resolving difficulties at the screening
checkpoint
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Be advised that the National Security Committee
is updating and will soon publish a revised Jepp-sized brochure with more
detailed information on transiting the screening checkpoint.
This document obviously does not address every question that may be raised
about security screening, but the National Security Committee will continue to
update the membership with answers to questions on this important subject as
appropriate. We thank you for your patience and professionalism as we strive to
create a better security screening environment for all airline pilots.
Fraternally,
Captain John Prater |
Captain Robert Powers |
President |
Chairman, National Security Committee
|
ALPA successfully developed CrewPASS to electronically verify airline pilot
identity and employment status. The Association has been working for more than
two years with TSA and other industry stakeholders to promote its
implementation, but a lack of funding has sidelined this effort. ALPA has
created a Web survey to gather pilot feedback about this flight crew screening
system. Please complete the survey and help the Association formulate its
strategy for future CrewPASS promotion and advocacy. |