Legal hunting in Canada

AáCanadian and an American were hunting in Canadian woods when an illegal alien runs across the field.
The Canadian takes careful aim, shoots, and kills him.
"You can't do that!" cried the American.
"No, no, it's legal here in Canada " replies the Canadian. Later that night the American goes and buys some beer and puts it on the roof of his truck to open the door.
Just then an illegal alien runs by, grabs the beer, and runs away. The American thinks "No problem" draws his pistol, shoots, and kills him.
As he is getting his beer the police come and arrest him.
"But I thought it was legal to shoot illegal aliens here in Canada !" protests the American.
"Well yeah," says the cop, "but you can't use bait."