Depleted uranium is used as ballast in jet aircraft (civilian) and sail
boats.
It is less toxic than lead.

and that's why the UN has classed it as a
Weapon with Indiscriminate Effect


Because the UN is the victim of junk science as much as if nor more so than
any other bureaucracy.
The UN is also constantly on the lookout for ways to harm the USA and the
free world as a whole, after all the free world as led by the USA and
opposed by France, Germany, Russia, and the PRC, led to the liberation of
Iraq and Afghanistan...

DU is completely harmless in metalic form, indeed less toxic than lead and
more effective as radiation shielding.
It's in fact less radioactive than the background radiation from the
universe or the concrete or brick from which your house is constructed (not
even talking about wood and steel).

Even enriched Uranium is not very radioactive. The danger from radiation
exposure in nuclear fuel is purely from the byproducts of the fission
process, not the Uranium itself.

Had Uranium been dangerously radioactive in fact there would by now be no
measurable quantities of the metal left on the planet. It would all have
decayed into other materials millions of years ago.