District of Columbia Code Division VIII. General Laws. § 48-803.03a. Dispensing of substitute drug products by pharmacists--notification of substitution.

(b)(1) The Department of Health shall create and distribute to all pharmacies signs that state in block letters not less than one inch in height: “This pharmacy may substitute a less expensive drug product that is equivalent to the one prescribed by your health care practitioner unless you request otherwise.

(2) Each pharmacy shall display the sign in a prominent place that has a clear and unobstructed public view at or near the place where prescriptions are dispensed.