Montreal police officers reportedly handed out 41 per cent fewer tickets in July 2014 compared to the same month in past years.
The number of parking tickets issued also dropped 19 percent, for the same time comparison.
The police brotherhood ruled out the drop is because of pressure tactics in response to pension reform plans, according to a report in La Presse.
The total loss for the city is estimated at $3 million.
Mayor Denis Coderre isn't ruling out any options to recuperate the lost funds, including penalizing the unions.