Sela, who helped design the security system at Ben-Gurion International Airport, has some 30 years' experience in the field. He warned the lawmakers, “You are reacting to incidents instead of being one step ahead of them” when the acquisition of the scanners was announced, days after a Nigerian national tried to blow up a U.S. airliner in December.Source: Israelnationalnews.com
“I don't know why everybody is running to buy these expensive and useless machines,” Sela commented. “I can overcome the body scanners with enough explosives to bring down a Boeing 747. That's why we haven't put them in our airport.”
This article from thesun.com provides a glimpse on how Israel airport implement security in the area.
Airport security is not a lazy type of job. You do not wait or react for airport security against terrorist. Terrorist organizations study and plot on security loopholes. If this is the case, reactionary measures like technology will be inefficient. In my opinion, technology has a place but it should not be the first line or the only line of defense. Careful and active observation and investigation should be the best weapon in preventing terrorist attacks.