Cops will designate someone to be rude and aggressive and another to be kind and sympathetic. This is called "good cop bad cop". Remember, there's only bad cops. No pro gunner would be a cop because the law is anti gun. The "bad" cop will grab you, shove you, search you, cuff you, and scream. The "good" one will try to tell you that you're not in trouble just as long as you comply. The "good" cop will generally be the one interrogating you. It's a common manipulation tactic.
The cops will try to threaten or coerce you into giving consent to search your property. They'll try screaming at you and holding their hands on their guns to intimidate you. They'll use arguments like that they're guaranteed to get permission from a judge, that you'll get your property back, or that you'll get jail time for not consenting to the search. If they didn't need your consent, they wouldn't ask for it. They won't only search for what's on the paper, they'll look for anything they can, especially drugs. They'll question you on your prescriptions. If you have the key to a safe on your keychain, a cop may hide it or throw it away so that they can accuse you of hiding it and gain more time in your place. Have a code on your phone and make sure nothing is accessible from the home screen.
When you get taken to the police station, you'll probably be interrogated. Nothing you say that it's in your favor will end up on the police report. Anything incriminating will. Words are added to police reports verbatim, with no context. They'll try hard to misinterpret your statements in order to incriminate you. Pay attention to what they say when you ask to speak with counsel. If they respond asymptotically, implying that you will get a lawyer but continuing to ask you questions, they're deceiving you. Ask many times so that you can argue in court that you expected to speak with counsel and were told that you would but were denied. Don't sign a Miranda disclaimer. There's nothing in it for you. It means you're getting arrested. At this time, they'll ask more direct questions like whether or not you did whatever you're being accused of. If you got intimidated and then spent the whole day in the police station answering question, you may not think anything of being instructed to sign a paper and answering more questions. They'll tell you that you won't get into any trouble by confessing and that you'll be able to go home. In most states, statements alone are not enough for a conviction but they can be used to prosecute you which may be worse than a conviction.
There's boxes in the police report that mark whether or not the crime, even if it's a victimless crime, is racially biased or gang affiliated. All it takes for it to be marked is for someone to tell. Any witness that's interviewed can say that you don't like darkies and are in a gang and that will further set the precendent against you in court even if there's no evidence.
When you're arrested, you'll get "incarcerated". You'll get sent to a part of the police station which resembles a jail where you'll be fingerprinted. You'll be given some documents that say when you need to be in court, what you're being charged with, and any areas you're prohibited from entering or people you're prohibited from communicating with. You'll be given a chance to make a phone call and bail yourself out. The cops may lie and say you can't bail yourself out with a credit card. You may end up being there longer than necessary. You can't leave so someone would have to bring cash to bail you out. Hopefully someone you know is nearby and has enough in cash to do so.