The hearing took place yesterday at the FEI headquarters in Lausanne, Switzerland.
The panel of the FEI Tribunal heard testimonies from expert witnesses and received additional submissions from the legal teams of both parties. It is now consider this further evidence.
Hansen, who shares his time between his career as a pop-singer and an international show jumping rider, was provisionally suspended along with three other riders for medication charges at the Olympic games.
If Hansen's hearing is unsuccessful, Norway could lose its bronze team jumping medal. If that happens, Switzerland would step up to the bronze position, with The Netherlands fourth.