Abstract: A radio receiver and its power supply are included in a circuit with a switch which is responsive to introduction of a force field, such as a magnetic field. When the field is activated, as by the introduction of a sufficiently powerful magnet, the switch is opened and the radio receiver is deactivated. Removal of the force field automatically restores the radio receiver to operable condition.

Abstract: A laser beam generating module is disposed at or near the butt end of a handgun in substantial alignment with the gun barrel. The module may optionally include means for activating the laser which are responsive to the horizontal or vertical attitude of the handgun, means for adjusting the aiming module for accuracy at various ranges, and means for suppressing the laser beam until the user of the handgun is ready to use it. A version of the invention places the laser module at the end of a magazine insertable into the handgrip of an automatic handgun so that the laser module is carried just adjacent the butt end of the handgun. Placement of the laser module at the butt end of the weapon yields accuracy adequate for routine police work, does not upset the balance and feel of the weapon, and it enables the weapon to be carried by its user in its conventional holster.

Abstract: Restraint apparatus for prisoners is worn beneath ordinary clothing so as to be unseen by the general public, in order that the prisoner's presumption of innocence not be denigrated by public display as is the case with manacles or the like. The apparatus operates by remote activation of an effective but nonlethal impact, such as a brief electrical interference with the somatic nervous system, or discharge of a small dose of tear gas or mace into the prisoner's breathing space.