I work for a device division of JNJ. We have hired Innovex (contract) reps in the past when we needed more feet on the street for a specific product. If the full time reps were selling 6-8 lines of product, the Innovex reps would just sell one of those lines. In my experience the Innovex reps were good quality people. Several of them were hired as full time reps after their contract expired.
I'm not sure if contract reps would work in MD&D to totally replace the regular reps. So much of our business is still relationship driven, but with Obamacare and pricing becoming so much more important, the relationships may end.