"Backscatter uses ionizing rays that scan the body, while milimeter waves uses electromagnetic waves which are both harmless waves, but gives us an opportunity to scan the passenger very quickly, and the TSA has also implemented a number of filters in order to maintain the privacy nof the passenger, but it does help us do two things: enhance security and maintain the privacy of that passenger, while quickly and efficiently getting them through the checkpoint."
The security officer who assists the passenger through the screening process never sees the image the technology produces. The scanned image is viewed remotely by a separate security officer who cannot see the traveler. Passengers will still need to empty their pockets and take their shoes off before going through the checkpoint. McCauley says the new technology benefits anyone who've had a hip or knee implant.
"They've had issues of alarming the walk-through metal detector. In this way, they typically don't alarm the milimeter wave or the backscatter, and its been very customer friendly. Actually, we've seen that over 99 percent of passengers choose this over the pat-down."
With two hip implants, passenger Bruce Brenneman knows the frustration of setting off the alarm.
"I have to go through security, I just plan for it, and the scatter technology, I think is great. They had it in Phoenix when it worked."
Other passengers I talked to liked the new technology.
"Some people have to get stopped and take off all their jewelry, I mean, the person in front of me actually had all that. And they had to be stopped so, something like that would work pretty well!"
Passenger: "They ought to screen everybody, it keeps us safer."
Passenger: "I think probably in time they'll have technology where we don't have to do anything but stand there and they can read everything."
The TSA will gauge public acceptance of the new technology. For now, both scanners are 100 percent optional for passengers at terminal E at Bush.
Pat Hernandez, KUHF-Houston Public Radio News.