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Your lawyer like sandiego dui defense lawyer will also observe if the chemical test was appropriately monitored under the conformation of the law. He will also subpoena the maintenance and calibration records of breath test machines used in your case. He will probably subpoena the officer’s training records to ensure he or she has been properly trained in the use of the breath test machine. Then he will obtain an independent Lab test of any blood sample to be sure the test result provided by the police is accurate, and that the sample is properly preserved, and has not been contaminated.