Ind. Code § 16-42-19-20 : HEALTH — REGULATION OF FOOD, DRUGS, AND COSMETICS — DRUGS: INDIANA LEGEND DRUG ACT —42-19-20 - Validity of prescriptions or drug orders TEXT PDF (a) Except as provided in section 30 of this chapter, a prescription or drug order for a legend drug is not valid unless the prescription or drug order is issued for a legitimate medical purpose by a practitioner acting in the usual course of the practitioner's business. (b) A practitioner may not knowingly issue an invalid prescription or drug order for a legend drug. (c) A pharmacist may not knowingly fill an invalid prescription or drug order for a legend drug. IC 16-42-19-20 Pre-1993 Recodification Citation: 16-6-8-3.5. Amended by P.L. 48-2015, SEC. 2, eff. 7/1/2015. As added by P.L. 2-1993, SEC.25.