They would send a few expendable soldiers and later on observe the effects of radiation sickness. Then they would try using the stuff as a weapon and discover

They would send a few expendable soldiers and later on observe the effects of radiation sickness. Then they would try using the stuff as a weapon and discover you can't clean up after throwing it at the enemy. A couple of cities would become uninhabitable and everyone will learn that when the sign says "do not touch", we actually mean it.