Well, it sounds like you put yourself behind the wheel on the DWI. They can't prove you were driving without some corroborating facts, but the wrecked car is enough under current case law. Of course they still have to prove you were intoxicated AT THE TIME of driving. That's a fact specific issue you'll have to discuss with your attorney.
As for the possession case, the State should be able to produce a lab report that specifies the weight of the drugs they received (they often also photograph), how much they used for testing, and the weight of the drugs remaining after the testing. If they have a scientist prepared to testify the drugs weighed in at over a gram, you're going to have an uphill battle. These are really just issues you are going to have to review with your attorney in greater detail.
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I've practiced in San Antonio for several years and if they are asking for 5 years probation on the possession case then they are probably in agreement with you pleading to under a gram. In regards to the DWI, they have what I consider to be a no dismissal policy while the DWI is on a pretrial docket, so I am pretty confident you will have to take the DWI to trial. If your lucky they will dismiss it at that point if their witnesses fail to show up. Otherwise you will have to fight it on the merits of the case itself.
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In my opinion, the only way you'll be able to effectively fight these cases (or evaluate any plea bargain agreement you're being offered) is through your attorney so I recommend consulting with him or her. I also strongly recommend that you refrain from posting further details on this or any other website. It is not confidential and you are making statements that could compromise your defense.
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