  The aim of this paper is to introduce current advances in technology that
could enable the development of fully drinkable and autonomous bio-electronic
CMOS sensors in the form of dust particles, capable of identifying the source
of a disease by targeting a specific region in organs and tissue such as a
tumor mass and automatically sending diagnostic information wirelessly outside
the body. We call this swarm of sensing dust particles Body Dust. A diagnostic
system in the form of Body Dust would need to be small enough to support free
circulation in human tissues, which requires a total size of less than 10 um3,
in order to mimic the typical sizes of a blood cell (e.g., red cells have the
diameter around 7 {\mu}m). Whilst with present state-of-the-art in CMOS
technology, this requirement in terms of size is currently un-feasible, recent
research has advanced technology such that we can begin to work towards such an
approach. Therefore, we present here the current limits of CMOS technology as
well as the challenges related to the development of such a system. Towards
this goal, this article presents the theoretical feasibility to obtain the
first ever-conceived sub-10-um Bio/CMOS integrated circuit with biosensing
capability to provide diagnostic telemetry once self-located in human tissue.
