D.C. Mun. Regs. tit. 18, r. 18-2506
Any police officer having reason to believe that the weight of a vehicle and load is unlawful is authorized to require the driver to stop and submit to a weighing of the vehicle and load by means of either portable or stationary scales, and may require that the vehicle be driven to the nearest public scales.
Whenever an officer, upon weighing a vehicle and load, determines that the weight is unlawful, the officer may require the driver to stop the vehicle in a suitable place and remain standing until such portion of the load is removed as may be necessary to reduce the gross weight of the vehicle to the limit permitted under this chapter. All material so unloaded shall be cared for by the owner or operator of the vehicle at the risk of the owner or operator.
D.C. Mun. Regs. tit. 18, r. 18-2506