Pennsylvania, which is one of 38 states that allows sobriety checkpoints, DUI-related fatalities have steadily decreased (404 last year, down from 542 in 2004), even as the number of arrests for people driving under the influence of drugs has increased dramatically (14,953 last year, up from 5,529 in 2004), according to George Geisler of the Pennsylvania DUI Association, which provides technical assistance to law enforcement officials.