LANSING, Mich. (AP) — The Michigan State Police has told officers to remove a phone app that keeps no record of outgoing text messages. Col. Joseph Gasper issued the order in a memo obtained by the Detroit Free Press. The newspaper has published stories about the use of the Signal app by high-ranking members of the department. Text messages sent using Signal are gone without a trace once deleted, the newspaper reports. The use of Signal was recently disclosed in a lawsuit involving state police. Critics say it can help officials dodge public records requests and frustrate attorneys during litigation.