state police trooper john harker is on highway patrol. with 11 years on the force's drug interdiction unit, harker has been involved in some of the riskiest and most high-profile arrests in the state. >> we worked in southwestern ohio with the intention of apprehending folks engaged in criminal activities, felony activities, drugs, stolen property, that type of enforcement. >> trooper harker's day starts like any other, with a traffic stop. he pulls over a driver going under the speed limit and whose 1977 blue chevy suburban is missing a front license plate. >> so i had to call the patrol post in wilmington and have a dispatcher run that. the license plate did match, at least the appearance of that vehicle, but that it was expired. >> but for now, this seems like it will be nothing more than a routine traffic stop. >> good afternoon, gentlemen. a visual scan of the vehicle as i walked up appeared that they were doing construction. there were soiled jackets, and, you know, heavy garments to wear outside in the weather. >> do you have i.d.