Is it normal hail, or is it small ice comets from the depths of space? Easy enough to tell, section one. Hail has a regular layered structure, like a pearl, or tree rings.
If that doesn't suit you, isotopic percentages in the water should settle it.
So9
California, acting on the tradgedy of Nebraska, now requires that homes be built with at least 1/2" steel rooves and that the hailstones be collected and used as grey water. All homes must be upgraded by 2004 or face foreclosure.