The old theory that police have a quota to meet and it is the end of the moth so they are targeting drivers is no longer valid/true.
Since the province downloaded POA court administrations and their cost onto municipalities, they also gave the revenue from POA offences to them as well (revenue neutral download)
Fo this reason, most municipalities have created "traffic enforcement" units, designated officers that are stationed throughout problem areas to ticket speeders, stop sign violators etc. These officers do it everyday of the month, not just last day of the month.
There is a section of the road in Markham, I see radar trap all the time, most often very early in the morning (6-8 am) because this is when due to light traffic most people misjudge their own speed and do not look at the dash and get stopped.
As for lidar/radar testing, I say this based on over 20 years of experience in electronics repair, calibration and design, you will have a very hard time (and by that I mean next to impossible) convincing me that the device was tested at 7 am and it worked fine, then tested at 7 pm and it worked fine, but it is doubtful it was working fine at 3 pm because it was not tested at 3:05 pm to verify it was still working fine.
Electronics are subject to drift, not question about that, they required regular checks and calibrations, there are difference specs for different time spans, 24hrs, 30 days and 1 year are most common, some also will provide 2 year specs.
Note these are uncertainty specs, each and every piece of equipments has an uncertainty, the uncertainty gets worst as the time is extended from the time the unit was calibrated.
In case you are scratching your head asking what is uncertainty, the old term "accuracy" was replaced by uncertainty many years ago, uncertainty is the doubt you are left with in the measurement after you have applied all corrections associated with the calibration of the device.
Now, if you can get an JP to understand that and not blindly accept manufacturers specifications, then you have won your case because simply put, police never apply any corrections to the measurement.
Note, truncated readings are not considered "correction"