[zulutango]

The owner's manual of the Laser unit in copyright material. Contact the manufacturer if you want to know for free what others have to pay for. Saying that there are other ways to detect speed is like saying that preventing a Cop from running after someone is not obstruction if you allow the Cop to walk after the person. Look at the CC definition of obstruction.

What is the definition of “obstruction”?
The definition of "obstruction" that has generally been applied by the court occurs when a person makes it more difficult for the police to carry out their duties. It is generally not an defence to argue that the police were eventually able to carry out their duties despite the attempt to obstruct them from doing so.
What does the Crown Attorney need to prove to show a person obstructed the police?
The Crown must first prove that there was an obstructing of a police officer. They must also prove that the police officer was acting pursuant to a lawful purpose. Next the Crown must prove that the obstructing affected the officer in the execution of a duty that he was then executing, and lastly they must prove that the person who obstructed the officer did so intentionally.

As a closing thought, the fact that they found jammer in your vehicle would be evidence that the Cops were right and that you had a jammer. I can't imagine what sort of an explanation that you could concoct to convince a Judge that you had a legal reason to have a device in your vehicle that was designed solely to obstruct Police in the execution of their duties. That would be a trial worth spectating.