About this video
A blood test feels like the end of a DWI case. It is not. Board Certified criminal defense attorney and former Vehicular Crimes prosecutor Brian Foley explains how blood evidence is actually produced — the warrant, the draw, the tube, the lab, the gas chromatograph — and where each step breaks down: improper draws, contaminated or fermented samples, chain-of-custody gaps, and the "retrograde" guesswork prosecutors use to estimate your alcohol level at the time of driving.
This video is educational only and does not create an attorney-client relationship.