I saw a question regarding this from May, but no-one actually answered this part. The MSDS for DDQ states that it reacts with water to produce HCN. I have seen papers showing that the reaction product of DDQ + water is an ammonium salt of DDQ with one CN replaced by OH. However I have been unable to find any specific reference to the production of HCN, or a mechanism by which it occurs. Some procedures are anhydrous, many others use water without any mention of a problem.
If you're able to point me in the direction of something that gives a true reflection of the likelihood and risk of HCN production then it would be much appreciated. I need to be able to satisfy others that the way in which we want to use it is safe.