PC 11350(a)(2) is possession of controlled substance that is a narcotic drug. 11377 was controlled substance not a narcotic drug.
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It sounds like the cop who arrested you either doesn't know his drugs or he doesn't know his code sections.
It is very common to be arrested on suspicion of one crime, and then to show up in court and find out that you're actually accused of something completely different. In your case, the arresting officer picked you up on suspicion of possession of a "dangerous drug". 11377 is usually meth, but it can also be for ecstasy, mushrooms, PCP, etc. 11350 is usually heroin or some other opiate drug.
Don't worry about 849(b)1. That's just the code section that deals with the procedures that police follow when they're applying for arrest warrants.
As for the delay, it's also very common for defendants to appear in court on the date and time that they were told to appear, and to find out that the DA is not ready for them. This has been happening more and more frequently these days because of budget cuts in the courts. It doesn't mean you're off the hook, it just means that the prosecutors need more time to get their act together. Show up on 2/8/11 and find out what you're actually accused of.
A charging decision is made by prosecutors after reviewing the police reports. Sometimes there is a lag in receiving and reviewing the report. As long as the delay is not unreasonable (and it doesn't look so in this case), the case will proceed. Health and Safety Code section 11350 concerns possession of a controlled substance for personal use. February 8th will be your arraignment date, meaning the court will let you know the formal charges against you, you'll be assigned an attorney if you don't already have one, and you'll be told what to expect as the case progresses through the system. Good luck.