If you use pot you are a criminal.
This is true even in Colorado and Washington, where the feds continue to outlaw cannabis. This is also true in California and other states that provide medical protection. This means the police not only have the right, but the obligation to try and stop you (though state police cannot enforce federal law). Fortunately, you do not have to help them. The United States Constitution gives you rights that protect you during police encounters. It is the job of the police to find evidence of a crime. It is not your job to confess or help them. They get paid quite well, so please do not do their job for them. Your job is to do and say the right things to protect yourself and defend your rights.
During a police encounter, the best case scenario is you will be let go with a warning or simple citation. The worst case is, you or someone you love will get hurt. No one should be the victim of police brutality, but it happens. Cops are jumpy. They are trained to be suspicious. Do not make any sudden moves they can claim were threatening. Be polite and respectful, even if the courtesy is not returned. Remember, the police do not have the final word and while they may be able to harass, intimidate, and arrest you, the real fight is in the courtroom before the judge and jury. But you must actually survive the police encounter first before you can win the battle in court.
To win that court battle, your lawyer needs to be able to prove the police acted illegally and the evidence should therefore be thrown out. The goal is to get all the evidence tossed so that there is no case left against you. If you give police permission, your lawyer will not be able to argue they acted illegally and there will not be much s/he can do to defend you. This is why what you do and say are very important. Your lawyer needs you to say the "magic words." These are words that limit what the police can do and will help your lawyer prove the police acted illegally.
The Magic Words
What are the magic words, you ask? The first magic words can set you free. Simply ask,
"AM I FREE TO GO?"
If they reply that you are free to go, then you are free to go. You may have to wait for the officer to finish the citation, but yes, you are free to go. If you are not free to go, then you must use the other magic words,
"I DO NOT CONSENT TO ANY SEARCHES,"
"I WANT TO REMAIN SILENT,"
"I WANT A LAWYER."
You must use all of the magic words and use them in this order. You must memorize and practice the magic words. During a stop, the police will not always tell you your rights or help you understand them. In fact, they are trained to harass, scare, and trick you into giving up your rights. You have to be strong while they get in your face and insult you. They are even allowed to lie. Do not believe them. Say the magic words, follow police orders, and shut up!
How do the magic words work?
The first question, "Am I free to go," clarifies if you are being detained or not. If you are being detained, the police cannot ask you questions without reading you your rights, just like on the TV cop shows. If they do not read you your rights, your lawyer can use this against them in court.
The second statement, "I do not consent to any searches," is critical. The cops are not allowed to just search you for any reason. They have to meet certain requirements like having probable cause or a warrant. Even if they have a warrant, they can only search within certain limits. For example, if the warrant is for plants, they cannot necessarily search drawers. But if you give consent, you are giving permission to search everywhere. Never consent to any searches! It will never help you or get the cops to go easy on you. If they need consent then they have nothing else against you so don't give it to them. If the police think they do not need consent, they will go ahead and search after you say the magic words. Stand out of the way and be quiet while they search. Maybe they find something maybe they don't.