 An authorised officer may also search the arrested person for anything which he might use to assist him to escape from lawful custody, but only if the officer has reasonable grounds for believing that the arrested person may have concealed on him anything of a kind mentioned in that sub-paragraph; and only to the extent that it is reasonably required for the purpose of discovering any such thing.The powers conferred by this paragraph to search a person are not to be read as authorising the officer to require a person to remove any of his clothing in public other than an outer coat, a jacket or gloves; but they do authorise the search of a person’s mouth.An officer searching a person may seize and retain anything he finds, if the officer has reasonable grounds for believing that the person searched might use it to cause physical injury to himself or to any other person, or the person might use it to assist him to escape from lawful custody.