I understand its the orgs that 'ban' the humanoid targets.... dont think there is any law controlling paper shooting, as mentioed trying to prevent any outcry in addition to the 'evilness' of the shooting activity itself.
...... I tend to believe the importation of human/humanoid paper targets are stopped at the border though (airports, bag search etc) not sure if this would be a discretionary or a stated prohibited import thing.....
You can be guaranteed the law enforcement agencies in Aus train with humanoid targets (and you could say human targets too!!) indeed the USA uses realistic photos as training targets of kids! young females! pregnant women! yup...Imagine if a mere citizen tried the same....wouldnt surprise me if the same was done in Aus, with the Feds, 'terror response' units and the intelligence services