Can I be illegally searched as a passenger with no probable cause ?

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I was a passenger in my brother's suburban, when it got pulled over because the tags expired a day prior , when the officer was bringing back my brother his license, he asked us to step out of the vehicle because his dog, which was way behind us inside the cop car, had given him a signal toward the SUV, than proceeded to take my brother , my boyfriend and myself out one at a time, search, us with no permission, no probable cause and no one in probation. I refused to let them search my purse we haven't done anything wrong , and I felt like we were being harassed again.so they found nothing in the SUV , or in my brother or boyfriend, after I refused over and over for them to search my purse, one of the coos says , because I was in the suv anf my purse also wad in there , he has the rigjt to search because the vechile was getting searched. They found 3 , 300mg . Gabapentin, and a half of clodiopin, that was inside an old wallet, in my purse, so on the report , he wrote only about me he said Ihe pulled over an SUV for expired tags, when the passenger kaleena Johnson, excited the car with her purse, she than gave verbal consent to see h , where they found the gabapentin. He wrote nothing about how he was searching the vechile without probable cause is why I excited, he never says , how he illegally searched all of us in his report, and I refused the search, nobody elses name is even on the report, and he did not put in there how and why he was searching us and vehicle. He gave me ten days to book in, I went to my first appearance where I said I would hire a lawyer, but is it possible to get this thrown out because of the coos failure to follow prodacale? I go back to court in the 27th, and have not found a affordable lawyer to represent me yet