First, do not listen to people who are not attorneys who are giving you poor advice. People are charged with DUIs and alcohol-related offenses all the time with breathalyzers or blood tests. All that they have to show is that they found alcohol in your possession or within your reach. I am unsure as to the basis for charging you with possessing pot if they never found any pot. We are missing something about the facts. Sit down with an attorney for a free consult and get some actual legal advice. Best of luck
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You need to obtain and review the District Attorney's discovery file (preferably with your attorney) in order to determine what evidence the charges are based on. Until you do that, you have no idea what you are talking about. Once you know what the evidence it, it will be possible to determine if some or all of the charges should be dismissed.
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I have found that although taking legal advice from police officers is almost always a bad idea, taking legal advice from friends IS always a bad idea. If there was alcohol in the home, and you had access to it, then it could be in your possession. That's the same with the marijuana. If they didn't find the marijuana, but they are going to have witnesses who say it was there, or if the police clearly smelled it when they entered, then they may have put in the charge. Whether or not they can prove it at trial is really the question. Please talk to a criminal law attorney in your area so you can provide more details, and get a clearer answer.
This legal information is provided for general legal purposes and does not establish a client-attorney relationship. Because of the limited information provided in the question, it is difficult to be certain that Counsel is answering the question correctly. You are encouraged to seek further information from an attorney directly so that follow up questions may be asked if necessary.