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acceleration accident reconstruction accident reconstructionist administrative license revocation admissibility alcohol or drugs analysis arrested for DWI attack blood blood-alcohol braking breath test calculations checklist chemical test collision conduct courtroom crash scene credibility criminal cross examination defendant defendant's vehicle defense attorney defense expert determine direct examination drag factor drinking driver Drug Recognition Expert DWI offense DWI-related elimination equation ethanol concentration event evidence example expert witness fact field sobriety tests Forensic friction impact impairment implied consent law influence of alcohol intoxicated Investigation Tip jurors jury kinetic energy law enforcement measurements Miranda warnings motion motor vehicle NHTSA nystagmus observations obtained officer's operator opinion person photographs physical police officer prior probable cause prosecutor questions reasonable refusal road sample skid marks specific Speed Estimates stage stop test result testify testimony tire marks toxicologist Trial Tip vehicle speed vehicular homicide voir dire yaw marks