*Things to do if the Police stop you* :
-Always speak respectfully.
-Don't run.
-Say: "Can I speak to my lawyer?"
-Say: "Am I under arrest?"
if the answer is 'no', or there is no answer,
Say: "Can I go now?"
-Do not consent to a search, even if they search you or your vehicle, this may protect your rights in court.
-Never act aggressively with a cop, they are trained to escalate, and can take you down everytime. Remember they have the power of the State behind them.
-Try not to answer leading questions.
-Answer questions with questions, or ask to speak to your lawyer first (even if you don't have one).

This may not stop an arrest, but at least you won't incriminate yourself, or give them useful information.

Good luck.

Remember, no matter who you vote for, the cops are always there.