OPINION
DALLY, Commissioner.
The conviction is for the sale of heroin; the punishment, imprisonment for thirteen years.
The appellant urges that the trial court erred in admitting into evidence the results of the gas chromatography test performed upon State's Exhibit 3 by Torraco, the chemist for the San Antonio Police Department. Torraco was qualified as an expert witness and testified that he used several procedures to determine that State's Exhibit...
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