Roadblocks in Canada - what are the rights?
The person recommends just handing the license and not saying a word to the police.
I wonder if the same advise applies to Canada? From what I have found online, you may be legally required to verbally state your name and address if you are in BC. Are you required to answer any other questions?
Perhaps not being "friendly" with the police will just make them investigate you, since they no longer need a suspicion to require you to do a breath sample?
I do not drink and drive (and I am very much against it), but I am also against roadblocks as I believe they give the police too much power.