Quintana technically wasn't doping, but my definition of doping is according to WADA definition, not my own opinion. An athlete and their team look at WADA code and it tells them what is doping/cheating and what isn't.Since the UCI took control of testing from AFLD again, the number of riders busted has drastically gone down. Armstrong's return, the attempt to replace the huge audience drop off in places like Germany following successive major doping scandals, and lawyers poking huge holes in the efficacy of the biopassport have been the biggest factors. Nowadays big names only get caught on technicalities like Quintana, when the police get involved like López, or when the UCI kicks an own goal like Contador or Froome.
To be fair, UCI didnt' have any control over results management even with CADF. Remember Lappartient getting angry with CADF's boss who wouldn't give him pre-warning of riders testing positive because it would break WADA RM Rules?