"ELF" frequencies, as we know now, are not the most invasive weapons-capable frequencies. Doses of ELF can act as either sedatives or stimulants, entraining the target's EEG as with the Russian LIDA machine. Weapons which can transmit hypnotic commands silently and untraceably, over distance and through walls, can cause a far wider spectrum of effects. In other words, victims, don't assume that "ELF" is the only form of electromagnetic signal which can do damage."