In 2003, at the 2nd European Symposium on Non-Lethal Weapons, Anatoly Korolev and his colleagues from Moscow State University presented a paper with the snappy title "Bioelectrodynamic Criterion of the NLW Effectiveness Estimation and the Interaction mechanisms of the multilayer Skin Tissues with electromagnetic Radiation." This is a study of how radio-frequency weapons -- like the American Active Denial System -- affect the skin. After wading through a mass of technical data showing how complex the interactions are we reach the punch line:

The sensations modality (pricking, touch, pressure, gooseflesh, touch, burning pain etc) depends on the field parameters and individual concrete human being factors. As a matter of fact, we can really choose the non-lethal bioeffect.

The effects include sensations similar to those discussed previously, and more besides. The paper discusses effects on cell membranes and affecting the body’s normal function, including "information transfer to the organs of control."

At the same conference, V Makukhin of the Trymas Engineering Center in Moscow described "Electronic equipment for complex influence on biological objects." And when he says "biological objects," he means you and me.

His laboratory apparatus uses a modulated beam of radio waves to produce what he terms "disorder of autonomic nervous system," put forward as a possible non-lethal weapon. Makhunin notes that there is no general agreement on how EM waves disrupt nerves - he mentions ion channels similar to those in the plasma paper - but he certainly seems to be seeing the same effects as American researchers.

But it need not be a non-lethal weapon. Makhunin also mentions the effects of "change of electrocardiogram" and what he calls "function break of heart muscle."

The vulnerability of the heart to electrical stimulation (including that produced by EM waves) is well documented. A lethal device would interfere with the electrical potentials that keep the chambers of the heart synchronized, producing fibrillation and rapid death. A death ray doesn’t need to be a truck-sized laser that reduces the target to smoking heap; a small device that stops the heart will do the job.

Little has been openly published in this area in the public domain, but this may be the tip of the iceberg. We are likely to be hearing more in future - especially if the Russians manage to find funding.

I don’t think we need tinfoil hats just yet. But a layer of conducting mesh built into body armor might save a lot of heartache in years to come.

The first stage is technology to “remotely create physical sensations.” They give the example of the Active Denial System "people zapper" which uses a high-frequency radiation similar to microwaves as a non-lethal means of crowd control.

Other weapons can affect the nervous system directly. The Pulsed Energy Projectile fires a short intense pulse of laser energy. This vaporizes the outer layer of the target, creating a rapidly-expanding expanding ball of plasma. At different power levels, those expanding plasmas could deliver a harmless warning, stun the target, or disable them - all with pinpoint laser precision from a mile away.

Early reports on the effects of PEPs mentioned temporary paralysis, then thought to be related to ultrasonic shockwaves. It later became apparent that the electromagnetic pulse caused by the expanding plasma was triggering nerve cells.

Details of this emerged in a heavily-censored document released to Ed Hammond of the Sunshine Project under the Freedom if Information Act. Called “Sensory consequence of electromagnetic pulsed emitted by laser induced plasmas,” it described research on activating the nerve cells responsible for sensing unpleasant stimuli: heat, damage, pressure, cold. By selectively stimulating a particular nociceptor, a finely tuned PEP might sensations of say, being burned, frozen or dipped in acid -- all without doing the slightest actual harm.

The skin is the easiest target for such stimulation. But, in principle, any sensory nerves could be triggered. The Controlled Effects document suggests “it may be possible to create synthetic images…to confuse an individual' s visual sense or, in a similar manner, confuse his senses of sound, taste, touch, or smell.”

In other words, it may be possible to use electromagnetic means to create overwhelming 'sound' or 'light', or indeed 'intolerable smell' which would exist only in the brain of the person perceiving them.

There is another side as well. The “sensory consequences” document also notes that the nervous system which controls muscles could be influenced to cause what they call “Taser-like motor effects.” The stun gun’s ability to shock the muscles into malfunction is relatively crude; we might now be looking at are much more targeted effects.