Yes both radar detectors and lidar jammers are legal in Alberta; for now and until legislative changes.
Although NO regular radar detector will save you from Lidar (the Dragon Eye system used by the police...in Edmonton and elsewhere) I find my detector does help with radar in City limits...both at intersections (photo radar for red light violations and speeding) and when the vehicle with radar is sitting along the side of the road. With the latter, it depends upon when the operator turns on his/her radar...if you don't see them in time and if they wait until the last moment just as you're about to pass, you'll be caught...unless they activate it for a vehicle in front of you and then your radar will pick that up in time to slow down.
For Lidar (Light Detection and Ranging) aka "laser", you need a more complicated and ++ expensive detection/jamming system on your bumpers that will jam the signal when it hits your vehicle and prevent a proper reading. For those with money who want the ultimate in radar/Lidar detection, they get a built-in system that combines both a radar detector and Lidar jammer. I've priced that out to be around $8,000 to $11,000 installed in my area and that's with a good installer that tests the system afterwards with an actual police Dragon Eye system, to ensure it works. Big bucks but some have done that.