Firearms can be seized by police when the individual does not have his or her Possession and Acquisition Licence or fails to provide documentation upon request by police. However, even if you are licenced and have registered firearms, the police can obtain a warrant if they have reasonable and probable grounds to believe an offence has been committed with a firearm. If the search warrant is granted, police can lawfully search your residence and seize any and all firearms.
Police can also seize firearms without a warrant where there exigent circumstances such that police are not required to get a warrant before seizing the property.