D.C. Mun. Regs. tit. 17, r. 17-10304
A dispenser that dispenses no covered substances within a twenty-four (24) hour reporting period shall submit a report documenting that zero covered substances were dispensed during that twenty-four (24) hour reporting period.
The Program may, upon written attestation that a dispenser possesses no covered
substances for dispensing, allow a dispenser to submit a permanent zero report. If at any time the dispenser begins dispensing covered substances, the permanent zero report shall no longer be valid and the dispenser shall start reporting at least every twenty-four (24) hours as required.
Dispensers that only dispense covered substances in circumstances not required to be reported, as set forth in § 10301.5, shall file a written attestation with the Program that they are exempt from reporting.
D.C. Mun. Regs. tit. 17, r. 17-10304