A very recent discovery shows that microwave radiation changes the permeability of the blood brain barrier. Our brain has its own immune system as does our body. The blood brain barrier keeps everything that is designed to be kept within the brain inside it and protects the brain from any unwanted diseases or chemicals which could harm it. Similarly it allows out of the brain anything dangerous to the brain. The blood brain barrier is rather like a sieve where only particles of a certain size may go through. Professor Salford at Lund University in Sweden has shown that such pulsing as from mobile phones can alter the permeability of the blood brain barrier (Appendix 5, Reference 3). I will argue as TETRA pulses, which is arguably more powerful than the average mobile phone, this situation could be worse with TETRA. dangerous distraction, tests conducted by the U.S. Department of Energy found that using a cell phone severely impairs memory and reaction times. “Hands-free” mobile speaker-phones cause even more crashes because they typically emit 10-times more brainwave interference than handheld units.