1. A drug tracking system comprising: a plurality of drug tags, wherein each of the plurality of drug tag comprises a plurality of food dyes; wherein each of the plurality of drug tag produces a spectral signature detectable by either photographic or absorption spectroscopic analysis; wherein the spectral signature produced by each of the plurality of drug tags is distinguishable from others within the plurality of drug tags; wherein each of the plurality of drug tags is used to identify a unique drug; and wherein the spectral signature is detectable in bodily waste.