There is no room for Kloner and Goren to get into details in such an article. Well, I do not know your case. If the legal definition of slander is indeed clear, it is the role of Zias and his defenders and hopefully other witnesses to demonstrate the reason for the former's claims. It is sometimes the weakness of sincere researchers to exagerate out of desapointment and some cold blooded persons who calculate more than they research, may take advantage to trample them more. The issue for S. J. is money not the defense of his honesty.
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: Controversy over Jesus' tomb reaches Petah Tikva court