If you are detained or arrested, you have the right to speak to a lawyer of your choice, PRIVATELY, including a free lawyer (Duty Counsel).
They must tell you that you have that right.
If you ask to speak to a lawyer, police must hold off questioning.
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Again: Not when you are driving a car.
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(This, by the way, is basically the crash Know Your Rights I will give at the beginning of protests when requested.)
On the original twitter thread, there were some great addenda that I am going to include as a screenshot and a note that:
Under R v Singh, if you've spoken to a lawyer and asserted your right to silence, cops can keep trying to question you; the right to silence isn't to be confused with the right to be left alone.
Don't talk to cops means don't talk to them at all.