If everything they list about it is true, then I think it could be a very useful tool that may actually be effective. I have concerns but

1) If it is completely passive, then there is no real physical harm to the pax other than the harm of ordinary life. So that is a good thing

2) I have a concern as to what can actually be seen. depending on that I may or may not have a concern

3) At 25 meters effectiveness, this could seriously change the way a security checkpoint is designed. (it may even make the process quicker.) I am almost thinking of the "Total Recall" system, but without X-Ray.

4) For some reason I see this being used in customs halls first before being used at a checkpoint. Reason being is that it should easily detect the mules.

However, from what little i have read, this actually looks to be a good idea. At least better than backscatter