I really shouldn't have. Don't underestimate your ability to make irrational decisions when you feel panicked. There wasn't anything illegal and they let me go

I really shouldn't have. Don't underestimate your ability to make irrational decisions when you feel panicked. There wasn't anything illegal and they let me go on my way. I was kind of frazzled after I told them I had a medical marijuana recommendation and they told me it was illegal federally. I didn't even know I was at a border control checkpoint at first, I took a wrong turn about 50 miles away from the border in San Diego county. They said they weren't looking for weed, but obviously they can and will lie as needed. my reasoning at the time (panicked) was that there was a small chance I might have had cannabis in the car. There was a dog alerting to the car, and I assumed it meant they'd end up searching it even without my consent. I believed them when they said they weren't looking for weed, but I also believed that if I denied consent to search and they searched anyway, if they found weed they were more likely charge me, as opposed to just letting me go if I cooperated and all they found was weed. So that was my flawed logic. I know it's always best not to consent, but I kind of panicked and gave consent anyway. Turns out the dog was alerting to my legal prescription medication.