West Whiteland Township Police made two driving-under-the-influence arrests this week after observing examples of impairment. In the first case, police said David Noonan, 31, of Downingtown, lost control of his vehicle on the Exton Bypass Saturday at 1:30 a.m. while trying to avoid a deer. When officers arrived to investigate the crash, they detected evidence of intoxication and issued a series of field sobriety tests. Noonan failed those tests and was placed under arrest for DUI. He was taken to the Chester County Hospital to have blood drawn for BAC analysis, after which he was booked and released to await a summons from the Exton District Court, police said. A 17-year-old West Chester youth was arrested for driving while intoxicated Tuesday in the Exton Station development. According to police, a patrol officer heard a crash and saw a vehicle travel over a curb and sidewalk. The vehicle came back onto the roadway and nearly struck the police car. The officer stopped the driver and immediately detected an odor of marijuana coming from the car and the operator. Subsequent investigation resulted in the discovery of a bag of marijuana and a smoking pipe. The driver was placed under arrest for DUI, taken to the Chester County Hospital for blood withdrawal, booked, and released to a parent. Charges have been filed with juvenile authorities.