You need to know when a warrant is invalid. Section 107 of the Search and Surveillance Act 2012 applies to a surveillance device warrant. This section is used as if it is talking about the surveillance device warrant, not a search warrant. You must consider what the Judge needs to be satisfied of under section 50C(2) and section 50C(4) when looking at the warrant. The Judge's conditions are important for the warrant to be valid. The rules for a search warrant are used in a similar way for a surveillance device warrant. If you want to know more about the Search and Surveillance Act 2012, you can look at the legislation. The rules for warrants are important to follow. You can also look at section 50C(2) and section 50C(4) for more information.