to harbour any such persons", and it is not practical to prevent such use, the officer can authorize the destruction of the building or structure. Compensation is payable for such destruction to a person if they can demonstrate to the Minister that the building or structure was constructed with the consent of the person lawfully entitled to the land on which it stood, and it was not liable to be forfeited. Even if the building or structure was subject to forfeiture, the Minister can still pay compensation to the owner or occupier if the latter person can prove that it was used by persons acting in a manner prejudicial to public security or for harbouring such persons without their knowledge or consent, and that they exercised due diligence to ensure that the building would not be used in this manner. Offences Chapter III of Part III of the ISA creates a number of criminal offences relating to security areas. Firearms, ammunition and explosives It is an offence to carry, or have in one's possession or under one's control in a security area without lawful excuse, any firearm, ammunition or explosive without lawful authority. The penalty for the offence is death. The onus is on the person charged to prove that they have a lawful excuse for having the item, and this can only be done by demonstrating that they acquired the item in a lawful manner for a lawful purpose, and did not act "in a manner prejudicial to public security or the maintenance of public order" while in possession of or having control of it. Furthermore, the person charged has lawful authority to have the item only if they: are a police officer, member of the security forces, or person employed in the Prisons Department, and have the item in connection with the performance of their duty; are licensed, or authorized without a licence, to have the item; or have been granted an exemption by an officer in charge of a police division, or are a member of a class of persons exempted by the Commissioner of Police. However, even if any of the above situations applies to a person, they will not be regarded as having lawful authority if they have the item for the purpose of using it in a manner prejudicial to public security or the maintenance of public order. In Liew Sai Wah v. Public