Whenever a person is charged in terms of this Act with an offence of failing to take reasonable steps to ensure that no firearm or ammunition is brought onto premises, a vehicle, a vessel or an aircraft under his or her ownership or control in contravention of this Act, proof that the firearm or ammunition was brought onto premises, a vehicle, a vessel or an aircraft under his or her ownership or control, will, in the absence of evidence to the contrary which raises reasonable doubt, be sufficient evidence that he or she failed to take such reasonable steps.