I don't think it's fair to compare the situation in Universal or the United States with the situation in Israel. Completely divergent and unrelated subjects that are not at all related when you consider the context in which these detectors are being used.
http://www.cnn.com/2015/06/01/politics/tsa-failed-undercover-airport-screening-tests/
I don't have an issue with security screenings (specifically detection devices), but I sure hope they're effective. So far, many of these common techniques that use screeners seem to fall by the wayside when it actually comes to detecting dangerous objects. Careful vigilance and intelligence seems to be the most effective technique used at theme parks thus far.
I hope Universal is investing in
that rather than simply using screeners and detectors to weed out potential conflicts.