After what happened with those boys in Japan, most people would not be so willing to do that- plus we can't bank on that- I guess worst case we could pay...
It is true that one has to be very careful, but some people gladly rely on the japanese story to be exempt from taking stuff for others.
I returned friday early morning from TLV, and I offered to whoever needed to take 2x 20kg to europe, but no one needed it.
Last time I took a box for someone else, and I asked security (tlv) to please scan it all the way, as I was asked to take it along. Since it was me telling them, instead of them finding out while asking their questions, it only took some 10 minutes longer, and that was it.