If you assume the dose is absorbed by the "whole body," then it isnt of any concern. However, in reality the energy is so low that almost all the dose is absorb

If you assume the dose is absorbed by the "whole body," then it isnt of any concern. However, in reality the energy is so low that almost all the dose is absorbed by the outer portions of skin, which could be more hazardous. Public-facing literature i've come across doesnt address this, so erring on the side of caution isnt a bad idea. More importantly it disincentivises use of these devices for security theater.