Nanotechnology is still quite a ways off.....it is in fact so close that grants are expiriing and some of the central websites that provided real info have closed down.
Nanotech is a rather elusive, technology that someday may bring about microscopic robots capable of what you think they are able to do, but right now, even inventory tracking devices are "macro" in size and their range is extremely limited (like a few feet)...all because of those little pesky laws of physics.
Remember, even though a technology shows promise and can be used for military/government applications it does not mean it will.
Fight the fights that there may be a chance of winning....that means fight TIA from the aspect that it can be done with existing tech. No need to look for stuff that even the producers of the latest Hollywood spy movies think is a little too "out there"