RT Article T1 A natural experiment to test the effect of sanction certainty and celerity on substance-impaired driving: North Dakota's 24/7 Sobriety program JF Journal of quantitative criminology VO 37 SP 647 OP 670 A1 Midgette, Greg A2 Heaton, Paul A2 Nicosia, Nancy A2 Kilmer, Beau LA English YR 2021 UL https://krimdok.uni-tuebingen.de/Record/1912632632 DO 10.1007/s10940-020-09458-6