6 months suspension is a ridicules short penalty for using performance enhancing substance. 6 months is not really a penalty at all. Many fighters don´t fight as frequent as every 6 months. This is very disappointing reaction from USADA.

Yoel Romero will be back in action more quickly than we thought after failing a drug test in December.

Source: Yoel Romero gets six-month suspension from USADA for failing drug test due to contaminated supplement – MMA Fighting