My question involves criminal law for the state of: California
Background Story (skip if too long)
I was pulled over for a supposed traffic violation, making a U turn over a double yellow line. The lane just right of the doulbe yellow , had a left turn sign painted in white to enter a business area plaza but I made a u turn. Once pulled over they asked for my license and registration. I asked why i was pulled over and was replied that i made an illegal U. Then, he asked if I had drank that night. THe officer said i smelled of alcohol. I had two drinks that night and at that point i replied that i did. I dont remember very clearly, but i was talking to him, saying i wasn't aware that was illegal blah blah,, etc. then he pulled me out of the car i believe forcibly, then started to pat me down, found my pocket knife and reacted as if i was a danger. Me weight roughly half the weight of each the officer, (two of them at the time) they seemed to be playing games. They told me to sit down outside on the curb while they called some special DUI unit so they can check me out. Once they arrived they gave me a test walking toe to toe etc etc. They patted me down again, and found a bit of methampetamine in my coin pocket. I don't remember the sequence of these actions as I was held in a cell for about 30 hour in addition to being nervous at the time. Whether all this matters or not I dont know. Anyhow also searched my vehicle and found a meth pipe. THey took me into the station, and gave me the choice to take a breath test or draw blood. It took me a while to decide and they were pushing me for being incooperative but i finally agreed to the breathalizer and got .07 twice. I was then locked up for around 24 hours and released. I forgot to mention before they released me, a detective spoke to me for a short time, but later i refused to discuss the matter any further without first getting some advice from an attorney. They took my phone, as evidence because they looked through it and saw a picture of meth on a scale.
My charge was 11377(A) / HS / F Poss Controlled Substance. ON the back, there is an additional charge section with 23152(A) / VC / M DUI Alcohol/Drugs but nothing filled out in boxes pertaining to the charge.
I received a detention certificate with reason for release per Penal COde Section 849(b)(1) with x(checked box) on Further Investigation
So my real question is what is going on? Do I just wait for something in the mail? Am I actually charged or is it possible they might drop the charges?
Thanks for taking the time to read. Apologize for my spotty writing, I've just been released and a bit traumatized as I was never arrested.

