The ruling could effectively render part of the federal government's current cyber-bullying bill unconstitutional.
The case involves a Saskatchewan man who is facing child pornography charges.
Police used the 19-year-old man's Internet address to get further details from his online service provider, all without first obtaining a search warrant.
Lawyers for the man contend that's a violation of his right to be protected from unlawful search and seizure.
Here are some other events happening around Parliament Hill today:
— Alice Wong, the minister of state for Seniors, will make an announcement regarding the New Horizons for Seniors Program to Jewish Family Services of Ottawa
— Statistics Canada will release the monthly survey of manufacturing for April. It will also unveil Canada's international investment position for the first-quarter and release a study on home care services provided to Canadians in 2012.