A warrant is a legal document issued by a judge or justice of the peace authorizing specific police actions that would otherwise be unlawful, such as searching premises, seizing property, or arresting individuals. The Canadian Charter of Rights and Freedoms protects against unreasonable search and seizure, making warrants the standard mechanism for authorizing intrusions on privacy. To obtain a warrant, police must demonstrate reasonable grounds to believe evidence of a crime will be found or that an arrest is justified. Warrants must specify what is authorized—search warrants describe locations and items sought, arrest warrants identify individuals. Executing warrants typically requires police to identify themselves and their authority. Evidence obtained without proper warrants may be excluded from trials. Warrant requirements balance law enforcement needs with individual rights protection.