Airport security guards already use hand-held electromagnetic wands to detect metal hidden under clothing. The same wand can also sniff for traces of the gases some explosives emit into the air.

If the passenger is a suicide bomber who realises the wand has found something, the guard might not have enough time to pull out handcuffs or a gun. So the new wand will have a hidden secret – a transformer which steps the detector’s battery power up to 100 kilovolts and feeds it to disguised metal electrodes at the end of the wand.

If the wand gives a silent warning of explosives, the guard can then subtly slide the pads onto the passenger’s neck or hands and press a shock button. The patent reassures that the effect is “temporary and reversible”.

So an innocent traveller who “happened to have a significant amount of metal on his person or happened to treat explosives legally” should wake up shaken but unharmed.

Read the shocking wand patent here (pdf file).