A reinforced packing tape having a tamper indicator is disclosed. The reinforced packing tape is constructed of a base layer of kraft paper having a lower surface coated with a water-activated adhesive and an upper surface printed with a tamper indicator pattern. A portion of the tamper indicator pattern is overlaid with a reinforcing film of transparent plastic. The plastic film is strongly bonded to the base layer such that when an attempt to remove the plastic film is made, the tamper indicator pattern is altered, degraded or destroyed; thus, a tamper attempt is indicated.