Horse Thief Detectives Life Membership Card. Material: paper. Size: 2 1/2" x 4 1/4". Description: white card; black print: "Waseca County Horse Thief Detectives, Life Membership, This certifies that Michael Gray, is a life member of this Association, entitled to all privileges and liable for all responsibilities appertaining thereto." Signed by President Fred Gray and Secretary Art Brisbane.