i don't think an experiment could be designed to prove God. The thing is, i don't think these people are dangerous or harmful (as was claimed on the programme). it's pretty patronising to think that the comfort that grieving relatives can get from visiting a medium, for example, is bad - i'm pretty sure that in most cases, time heals and in others, it's just a way of coping at the time (i bet many are aware on some level that they are suspending disbelief). admittedly, on occassion, some might go on an expensive and lengthy quest. for the rest of us it could be seen as... entertainment?