When a law-enforcement officer, while engaged in court authorized electronic interception in the manner authorized herein, intercepts communications relating to offenses other than those specified in the order of authorization, the contents thereof, and evidence derived therefrom, may be disclosed or used as provided in section seven. Such contents and evidence may be disclosed in testimony under oath or affirmation in any criminal proceeding in any court of this state or of another state or of the United States or before any state or Federal grand jury when authorized by a judge who finds on subsequent application that the contents were otherwise intercepted in accordance with the provisions of this article. Such application shall be made as soon as practicable.