You should probably hire an attorney, while this is a "first offense" the judge and prosecutor are aware of your history. Even if the fist time you were dealing with the Juvenile system you were not prosecuted for the alcohol related charge both the Prosecutor and the Judge will be aware that the case involved alcohol. Because of your history the Judge will likely be less lenient and the DA will seek more punishment than the minimum. A lawyer familiar with breath testing devices may be able to cast enough "doubt" on the issue that your case gets dismissed, reduced or sentenced in a more lenient manner.
Answered on Jul 25th, 2013 at 12:29 AM