According to the initiative, students would have several options to confirm their sex: a visual genital exam, a lab test to determine their genetic makeup, or an analysis of testosterone levels in the blood. The genital exam, which a medical professional can conduct without touching the child, would likely be the most accessible option for most kids.

Conservative hedge fund manager Brian Heywood and his political action committee Let’s Go Washington are backing the measure.

Heywood said he didn’t believe his initiative would add anything new to existing medical requirements for student athletes, a position he also stated to KUOW in September 2025, shortly after launching the measure.