The warning notice provided in the maintenance manual for the Lockheed Jetstar with respect to the DU mass balance weights warns against cutting, grinding, drilling or otherwise disturbing the weights or their lead coating. Or words to that effect. I have always interpreted that as an admonition not to allow myself to be exposed to lead or DU particulates which may be associated with such activities.
I have heard that US customs has on occasion detected the radiation emanating from from DU balance weights and possibly certain smoke detector sensors during routine aircraft border entry inspections, but haven't experienced that myself. Apparently their equipment must be capable of detecting very low levels of radioactivity!
Despite any assurances to the contrary, depleted doesn't necessarily mean depleted completely! Get this stuff inside your body and I doubt it does one any good. In any case, I won't be knowingly exposing myself to DU or lead dust if I can help it.