who identify and compete as male. In 2019, the IAAF lowered the maximum level to 5 nmol/L. Professional tennis player Renée Richards, a transgender woman, was barred from playing as a woman at the 1976 US Open unless she submitted to chromosome testing. She sued the United States Tennis Association and in 1977 won the right to play as a woman without submitting to testing. Sex verification Chromosome testing The practice of chromosome testing came under scrutiny from those who feel that the testing was humiliating, socially insensitive, and neither accurate nor effective. The testing is especially difficult for people who could be considered intersex. Genetic differences can allow a person to have a male genetic make-up and female anatomy or body chemistry. In the Journal of the American Medical Association, Simpson, Ljungqvist and others stated, Hormone testing Women with higher levels of androgen (particularly testosterone) are often considered to have a competitive advantage over other women since women statistically have lower levels than men. This difference in androgen levels is the reason many sports requiring athletes compete only among their own sex. However, others argue that expecting women athletes with naturally higher levels of testosterone to lower these levels by medical/pharmaceutical methods completely contradicts the purpose of doping regulations, which require athletes to not take any substances that their bodies do not generate naturally. In January 2010 in Miami, instead of succeeding in improving the policies specifying whether an athlete should participate as a woman or a male, medical professionals experienced ambiguity in regards to these policies. Alice Dreger states it is risky to publicly reveal that an athlete is no longer allowed to compete as a woman without first informing the athlete. For example, Caster Semenya found out through public media that the tests she had taken were meant to determine whether she is female or male. Another athlete, Santhi Soundarjan, had a suicide attempt subsequent to failing the test for determining her gender and being stripped of her 2016 Asian Games medal. A scholar questions whether men with androgen levels similar to those of women will be permitted to participate in the women's category or instead be granted the opportunity to increase their androgen levels to those of other males. This is the logical and fair result how policies using functional testosterone to decide eligibility to compete as a female or a male work for women. Males