McMahon Summarily Suspended, Off All Mounts At Sam Houston Sponsored by: Jockey C.J. McMahon Jockey Charles “C.J.” McMahon, arrested on Jan. 2 in Lafayette, La., and charged with attempted murder, illegal use of weapons and possession of schedule 1 drugs, has been summarily suspended by Texas Racing Commission stewards and taken off all mounts at Sam Houston Race Park, which kicks off its 2021 meeting on Friday evening. The ruling states that McMahon “admitted to recent use of Marijuana and tested positive for Marijuana on a field test kit on Jan. 5, 2021. Jockey Charles McMahon is hereby summarily suspended starting on Jan. 5, 2021, pending a hearing.”