1) 28 Days - or more - Prior to Trial: A copy of the certificate, along with an explanation of Defendant's right to object and require presence of the person who performed the test to be present in court, must be sent both to Defendant (or counsel) and the Clerk.

2) 14 Days after Certificate Delivered: Defendant's right to have tester present is waived if Commonwealth not notified prior to this date.

3) Prior to Trial: Defendant must raise any claims not to have received timely notice from the Commonwealth prior to trial. The Commonwealth's proof of provision shall be prima facie evidence that it was delivered on that date.

4) If the Trial Court finds that notice was not timely given or that the Commonwealth, after exercising due diligence, cannot have the tester in court on the trial date, shall continue the case.

5) Continuances: Up to 90 days "if the accused has been held continuously in custody." Up to 120 days "if the accused has not been held continuously in custody." No continuance pursuant to this section shall count against Virginia's speedy trial statute.

6) Preliminary Hearings: None of this is required to use a certificate in a preliminary hearing.