Slice and Shamrock had banned substances in their system per the results of drug tests taken before the card, which took place Feb. 19 in Houston, Texas, multiple sources said.
Both men have been administratively suspended by the Texas Department of Licensing and Regulation (TDLR) pending an adjudication process, sources said. The official test result documents, showing the exact substances Slice and Shamrock tested positive for, have been withheld by the TDLR due to potential pending litigation. Athletes on the card had urine samples taken before their bouts.
Typically, the maximum discipline for combatants who fail drug tests in Texas is a 90-day suspension and $5,000 fine.