the cryptic we're back with the d-w-i king, sergeant toby lafave.he holds the record for the most dwi arrests in the history of the new mexico state police. and in his 18 year career, he has seen it all. but there was one bus that even surprised the sergeant. >> so this car in front of us. i've been watching him for a little while. it seems to be having trouble keeping the vehicle in just one lane. >> it's just another day in the life of sergeant lafave. >> so how much? how much do you have to drink today? >> i don't know how. >> to answer that question. >> because honestly, actually, was it one beer or two beers? no beers. there's one. there's one beer. okay, you stand right there on my light. stand on my light. >> he begins his usual battery of tests to gauge the driver's level of impairment. >> so a finger? yes, sir. follow my finger tip with your eyes only. don't move your head. any questions? >> i'm a little nervous. >> gotcha. why are you nervous? >> how can he not be nervous? >> all right. ready? i'm ready whenever you are. watch my police ca