This is part of the "Ontario Highway Traffic Act"
Power of officer to have vehicle weighed, examined
124. (1) A police officer or officer appointed for carrying out the provisions of this Act may stop any vehicle or combination of vehicles, direct the driver to such location as is reasonable in the circumstances, direct the driver to drive the vehicle or combination of vehicles on or off of a scale in order to weigh the vehicle or combination of vehicles using portable or stationary scales, and measure and examine the vehicle or combination of vehicles to determine its nature and dimensions. 2002, c. 18, Sched. P, s. 28.
Load removed or redistributed
(2) Where it is found that the gross vehicle weight, axle unit weight or axle group weight of any vehicle or combination of vehicles is in excess of the limits permitted under this Act or the regulations, or under the permit issued for the vehicle or combination of vehicles, the police officer or officer appointed for carrying out the provisions of this Act may require the driver to redistribute or remove as much of the load as is necessary to ensure compliance with this Act, the regulations and the permit. 2002, c. 18, Sched. P, s. 28.
Penalty
(3) Every driver who, when required under subsection (1) to stop, drive to another location or drive the vehicle on or off of a scale, refuses or fails to do so is guilty of an offence and on conviction is liable to a fine of not less than $200 and not more than $1,000 and to the suspension of his or her driver’s licence for a period of not more than 30 days. 2002, c. 18, Sched. P, s. 28.
Same
(4) Every driver is guilty of an offence and on conviction is liable to a fine of not less than $100 and not more than $200 who,
(a) when required under subsection (2) to redistribute or remove part of a load, refuses or fails to do so or to cause it to be done; or
(b) obstructs any weighing, measuring or examination authorized by this section. 2002, c. 18, Sched. P, s. 28.
Here is link to whole act. Good reading if your bored.
Highway Traffic Act, R.S.O. 1990, c. H.8