Effective BUI defenses include challenging the traffic stop legality, questioning field sobriety test administration and reliability, and attacking breath testing accuracy and equipment maintenance. Medical conditions, medications, and environmental factors can affect test results, providing valid defense explanations. Improper officer training in BUI procedures or violations of proper investigation protocols justify case dismissal. Lack of probable cause for the initial stop eliminates all evidence obtained afterward under the fruit of the poisonous tree doctrine. Your attorney develops defenses specific to your case circumstances and investigation findings. Every BUI case contains potential defenses worth exploring.