Original sentence: , impairment is “per se” because actual inability to function need not be established), effectively reduce alcohol-related motor-vehicle deaths.There is strong evidence supporting the effectiveness of selective breath testing sobriety checkpoints as a public health intervention aimed at reducing the harms associated with alcohol impaired driving.There is strong evidence that laws adopting decreased blood alcohol content levels and per se BAC laws set a blood alcohol limit at which an individual is considered legally impaired (i.There is strong evidence that laws adopting decreased blood alcohol content levels for drunk drivers under age 21 effectively reduce alcohol-related motor-vehicle deaths.There is strong evidence to support the effectiveness of a minimum legal drinking age of 21 years as an intervention aimed at reducing alcohol involved motor vehicle crashes
Edited sentence: , impairment is “per se” because actual inability to function need not be established), effectively reduce alcohol-related motor-vehicle deaths, but such evidence has never taken into account other factors that may have contributed to  a decrease in alcohol related deaths, such as increased built in safety features in automobiles, decreased speed limits and increased speed enforcement, and increased advertising and awareness about DUIs.000 BrAC) laws regarding drinking and driving for under 21 drivers, designated drivers, societal pressures, DUI enforcement, and DUI advertising contribute to an overall decrease in youthful driving excursions while under the influence.080 BrAC per 210 litres of breath) setting  a blood alcohol limit at which an individual is considered legally impaired (i.There is  evidence suggesting that laws adopting decreased blood alcohol content levels for drunk drivers under age 21 reduces alcohol-related motor-vehicle deaths, as drivers under 21 years of age make up the largest segment of drunk driving related accidents, injuries and deaths.There is evidence suggesting that laws adopting decreased blood alcohol content levels and per se BAC laws (.There is evidence suggesting that selective breath testing sobriety checkpoints as a public health intervention may reduce  alcohol impaired driving, but no evidence suggesting that this intervention results in an actual decrease in alcohol related deaths or serious injuries.There is questionable evidence supporting the effectiveness of having a minimum legal drinking age of 21 years  aimed at reducing alcohol involved motor vehicle crashes, largely because no study has effectively managed the large amount of variables involved in assessing this complicated area of DUI enforcement; many factors, such as zero tolerance (