Andrew Leigh has little difficulty summoning a haunting argument for gun control in Australia.
As a law student at the University of Sydney in the mid-1990s, he gained experience as a summer clerk with the law firm Minter Ellison.
There, his mentor was a young lawyer named Zoe Hall.
In late April, 1996, Ms Hall and her boyfriend Glenn Pears took a holiday to Tasmania, and fatefully, they travelled to Port Arthur.
