Do they expand?

The law in Alberta states " It is unlawful to set out use or employ any of the following for the purpose of hunting big game:

ammunition that contains non-expanding bullets."

I would guess it depends on what kind of aloy they are cast from. Then I wonder how, in law, it would be determined weather a bullet is non-expanding. Shot into a sand bank I would think any cast bullet would expand at least a tinny amount.

The legal question aside, can cast bullets be used to kill game effectivly or should they not be used, legal or not?

Robin