Legal Question in DUI Law in Virginia

Re: Personal breathalyzers

In a full-fledged trial of the DUI case, where there is reason to doubt the BAC test results reported on the official state certificate of analysis, it's possible (in my opinion) that a court might permit the results from the defendant's personal breathalyzer to be admitted in the defendant's case in chief.(The weight, however, to be given to this evidence by the judge would depend upon a variety of factors, and it could be marginal at best.)