---
title: DUI Breathalyzer and Blood Test Challenges in San Diego
slug: dui-test-challenges-san-diego
article_type: Help Article
keywords: breathalyzer challenges, DUI tests
url: https://msklawyer.com/dui-charge-reduced-or-dismissed-in-california/
published_date: 2025-10-27T00:00:00
---

Breath and blood tests may be challenged on grounds like improper calibration, contamination, or medical conditions influencing results. San Diego DUI defense attorneys use expert witnesses to question the reliability of such tests.[msklawyer.com]