ARD Sportschau: Doping Controls via GPS monitoring?

The current doping control system: data protectionist specialists consider it to be unlawful and athletes find it impractical. Currently a german former track and field athlete is developing an alternative model based on a GPS transmitter. Is this the beginning of a new era in the fight against doping in sports or is it a step towards total surveillance.
http://www.ardmediathek.de/tv/Sportschau/Doping-Controls-via-GPS-monitoring/Das-Erste/Video?bcastId=53524&documentId=40937374