It's one thing to be right and stand up for your rights, but this guy has nobody to blame but himself. He's going to get fucked right over even if it happened exactly like he said it did.
In court it's going to be his word against all of the officers that were there. They're going to say the dog alerted and gave them probable cause and it doesn't matter if he saw the dog's alert or not. They don't have to prove to him the dog alerted. They'll then say after they had probable cause they instructed him to get out of his vehicle and he refused to obey their instructors. At that point he was detained, he resisted, and was finally subdued and arrested.
Now granted you do have the legal right to resist an illegal arrest. However, any lawyer will tell you what you _SHOULD_ do is comply, and then after the fact seek justice through the courts. Anybody who goes out of their way to be a dick to police, refusing their commands and locking themself in their car should reasonably expect a response they are not going to like.
Chris Rock said it best. "If you make the police chase after you, they're bringing a beat down with them".
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