I was actually arrested for possession of marijuana under 2 oz less than 3 weeks ago (I live in Texas). My 3 friends and I were in my friend's car, and since none of us admitted the weed was ours- they charged all of us with it.

Did you in any way incriminate yourself? This is very important (my 3 friends all admitted to having smoked some of the weed- while I plead the fifth- and now they have no choice but to go on probation for 12 months, take 6 random drug tests, and pay for drug awareness classes). If you have in no way incriminated yourself with the weed- it was just closer to you than to everyone else- then you have the possibility of getting the case dismissed, although you need to plan on paying $1000-$2000 for a lawyer.

I'd advise you to start looking for a lawyer in the city/district/county you were arrested, since they'll know all the DAs and judges. Getting a lawyer is a must- you don't want this to end up on your record. I ended up paying $1350 for mine.

In the meantime, I know this sucks, but you should probably get clean. It'll be very important for you to pass a drug test soon if your lawyer is unable to get the DA to dismiss the case right off the bat, and then you'll need to decide whether you want to spend the money to go to court or spend your money to go down the path of deferred adjudication- the 12 months of probation, classes, etc. (The addition fee for going to court is going to be steeper, but if your lawyer wins, there's no drug tests, probabtion, classes, etc.)

Hope everything works out for you, man.