We disclose a drug tracking system and method of use which may be used to screen a user's bodily waste and to collect information about the drugs the user has consumed. The system includes mixing or adhering a drug tag with a drug compound. The drug tag includes at least one nucleic acid or nucleic acid analog, the unique nucleotide sequence of which correlates to information about the drug. The unique sequence may correlate with a drug molecule, a drug class, a manufacturer, and/or a distributer. Each of these categories of information may be incorporated into the nucleotide sequence of a separate nucleic acid or nucleic acid analog molecules or combined in a single molecule. The sequence of the drug tag may be entered into a database which stores the drug information associated with each discrete nucleotide sequence.