Top UFC women’s bantamweight contender Mayra Bueno Silva has received official punishment from the Nevada Athletic Commission (NAC) after she tested positive for a banned substance during a urine test conducted in connection with her July 15 victory over Holly Holm. While Bueno Silva’s positive test for ritalinic acid was previously revealed by the fighter and the commission, she officially received disciplinary action at a monthly NAC meeting Tuesday: 4.5-month suspension, $11,250 fine that equates to 15 percent of her purse, and legal fees totaling $314.50.