Partial Source: The Wrestling Observer
While HGH or human growth hormone is a banned substance for the WWE, many wrestling organizations do not test for the substance since it is harder to detect with standard urine tests. HGH has become a topic of discussion due to the recent drug test failure of UFC fighter Cung Le, who tested positive for excessive amounts of HGH after his fight with Michael Bisping at UFC Fight Night 48 in August.
According to sources, WWE does not test for HGH even though it is on the banned substance list. The setback with the tests is that testing for HGH is expensive, and previous drug tests for HGH were unreliable. Unless the user is caught quickly after injecting the substance, it is harder to detect.
In the Ultimate Warrior documentary on the WWE Network, Vince McMahon mentioned that Warrior and British Bulldog were experimenting with HGH before both were let go from the company in 1992.
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