Wiktionary
a. Able to be tracked, or worthy of being tracked.
WordNet
adj. capable of being traced or tracked; "a traceable riverbed"; "the traceable course of an ancient wall" [syn: traceable] [ant: untraceable]
Usage examples of "trackable".
They hiked far down the river to a favorite pig wallow off the trail where the dogs sniffed and snorted and snapped at one another, utterly unable to follow out a single trackable spoor.
Mother Ship or whatever exactly it was that was surely their origin also went away: not away in any trackable or pursuable direction, just away, becoming less distinct on the various tracking and spying devices, producing less data, fibrillating, becoming see-through finally and then unable to be seen.
I do not think they have bothered to place trackable implants in individual bodies.