Jon Jones’ reign atop the UFC’s light heavyweight division appears to be over once again.

The UFC confirmed in a statement Tuesday night that Jones has been notified of a potential violation of the anti-doping policy by the USADA. The failed test came following weigh-ins for UFC 214 last month.

Jones returned from a suspension for taking a banned substance at the event, besting Daniel Cormier to win back the belt that he was previously stripped of.

Below is the UFC’s statement:

The UFC organization was notified today that the U.S. Anti-Doping Agency (USADA) has informed Jon Jones of a potential Anti-Doping Policy violation stemming from an in-competition sample collected following his weigh-in on July 28, 2017.

USADA, the independent administrator of the UFC Anti-Doping Policy, will handle the results management and appropriate adjudication of this case involving Jones, as it relates to the UFC Anti-Doping Policy and future UFC participation. Under the UFC Anti-Doping Policy, there is a full and fair legal process that is afforded to all athletes before any sanctions are imposed. The California State Athletic Commission (CSAC) also retains jurisdiction over this matter as the sample collection was performed the day before Jones’ bout at UFC 214 in Anaheim, CA, and USADA will work to ensure that the CSAC has the necessary information to determine its proper judgment of Jones’ potential anti-doping violation.