201.If access to premises used wholly or mainly as a dwelling is necessary because there are reasonable grounds to believe that an offence under section 95 has been committed, and entry is required to ascertain whether or not such an offence has taken place, a written application must be made to a justice of the peace. This section enables a justice of the peace to issue a warrant authorising a constable or authorised officer to enter the dwelling, if need be by force. A warrant can be issued in a format other than a hard copy document, such as an electronic version. The warrant will be in force for 28 days beginning on the date it was signed by the justice of the peace.