TOPEKA, Kan. (AP) 鈥 Mack Allen, an 18-year-old high school senior from Kansas, braces for sideways glances, questioning looks and snide comments whenever he has to hand over his driver's license, which still identifies him as female.

They've come from a police officer responding to a car accident. They've come from an urgent care employee loudly using the wrong name and pronouns. They've come from the people in the waiting room who overheard.

鈥淚t just feels gross because I鈥檝e worked so hard to get to where I am now in my transition, and obviously I don鈥檛 look like a woman and I don鈥檛 sound like a woman,鈥 said Allen, who has been on testosterone for two years.

Kansas enacted a law last year that ended legal recognition of transgender identities. The measure says there are only two sexes, male and female, that are based on a person鈥檚 鈥渂iological reproductive system" at birth.

That law and others introduced around the nation this year 鈥 often labeled as "bills of rights" for women 鈥 are part of a push by conservatives who say states have a legitimate interest in restricting transgender people from or using bathrooms that align with their gender identity.

Critics argue the proposals to legally define sex as binary are essentially erasing transgender and nonbinary people鈥檚 existences by making it as difficult as possible for them to update documents, use facilities and generally participate authentically in public life.

They鈥檙e also creating uncertainty for the many intersex people 鈥 those born with physical traits that don鈥檛 fit typical definitions of male or female 鈥 with the measures unclear on how people would prove they鈥檙e exempt.

Some of the measures would remove the word gender, which refers to social and self-identity, from state code and replace it with sex, which refers to biological traits, conflating the two terms. Others make gender a synonym for sex. say the efforts rely on an outdated idea of gender by defining it as binary rather than a spectrum.

鈥淵ou pass a law because there's a problem. The medical community doesn't see people having different gender identities or being born with an intersex condition as a problem for society," said Dr. Jack Drescher, a clinical professor of psychiatry at Columbia University who edited the section about gender dysphoria in the American Psychiatric Association鈥檚 diagnostic manual. 鈥淭he medical community can only stand back to say, what exactly are you passing this law to protect?鈥

Measures have been proposed this year in at least 13 states 鈥 Alabama, Arizona, Florida, Idaho, Indiana, Iowa, Mississippi, Missouri, Oklahoma, South Carolina, Utah, West Virginia and Wyoming 鈥 and advocates expect that number to grow. The bills follow a historic push for restrictions on transgender people, especially youths, by Republican lawmakers last year. At least 23 states have banned gender-affirming medical care for transgender minors, and some states are now shifting their focus to , as well. Others have moved on restroom and sports restrictions.

Many political observers say the Republican focus on transgender people is an attempt to rally a voting base with a 鈥渨edge issue" to replace abortion rights, which the public has largely favored, . The efforts also worry transgender people and their allies that they're further stigmatizing and threatening a community already at high risk of stress, depression and suicidal behavior.

With the latest round of bills defining man and woman, it's clear 鈥渢he intent is to make it as difficult as possible for transgender people to operate within a state," said Sarah Warbelow, legal vice president of the Human Rights Campaign, a large LGBTQ+ rights group.

鈥淚t's an attempt to deny transgender people's existence,鈥 she said.

A similar proposal in Iowa put forward by Republican Gov. Kim Reynolds led to protests at the state Capitol. The bill was introduced soon after the failure of a lawmaker鈥檚 effort to remove gender identity from the state鈥檚 civil right law. It would narrowly define male and female and require a transgender person鈥檚 assigned sex at birth to be listed alongside their gender identity on their birth certificate.

鈥淲omen and men are not identical; they possess unique biological differences," Reynolds said after introducing the measure. "That鈥檚 not controversial, it鈥檚 common sense.鈥

The sponsor of a similar bill passed by the said the legislation is needed to allow restrictions on who can use single-sex restrooms, locker rooms and changing areas.

鈥淎t any given time, we're unable to protect single-sex spaces,鈥 said Del. Kathie Hess Crouse, the measure's sponsor, said. 鈥淚f we don't have a definition, we can't protect them.鈥

Jocelyn Krueger, of Grinnell, Iowa, joined protesters at the statehouse days after testifying to lawmakers that she opposed the failed effort to remove gender identity from the civil rights law.

Krueger said she鈥檚 concerned about potential repercussions of the bill, given that a person鈥檚 identifying documents 鈥渦nlock basic participation鈥 in everyday life.

She compared it to how she was temporarily unable to get money from her bank account when she was updating her documents. Krueger worries the Iowa bill could create similar challenges for trans residents, but longer term.

鈥淣ot having access to documentation, or things that out you in a way, or where your documentation doesn't match, puts you at risk for all of those daily interactions where people are looking at your documentation,鈥 Krueger said.

The Williams Institute, a think tank at UCLA Law, estimates there are 1.3 million transgender adults in the U.S. But represent 1.7% of humans, which would translate to over 5 million in the U.S. alone.

In Alabama, lawmakers added language to legislation defining male and female that sex can be designated as unknown on state records 鈥渨hen sex cannot be medically determined for developmental or other reasons.鈥

West Virginia's proposal specifically states that someone who is intersex is 鈥渘ot considered a third sex.鈥 But the measure says people with a "medically verifiable鈥 diagnosis of it should be accommodated.

Before this year, Kansas and Montana, North Dakota and Tennessee had enacted laws defining man and woman in state code. Oklahoma 鈥 where advocates say a law restricting bathroom access helped create a climate that led to the bullying of , who died after a fight in a girls bathroom at a school 鈥 already has a measure by executive order, as does Nebraska.

Before Tennessee's law took effect, advocates held events to assist people on changing their names and gender identities on government documents.

鈥淭here's a lot of potential for harm that seems ready to explode at any moment,鈥 said Dahron Johnson, of the Tennessee Equality Project.

In South Carolina, amendments have been proposed to the state constitution to narrowly define male and female. But the measures face an uphill battle in clearing the Legislature by an April 10 deadline in order to make this fall's ballot.

Opponents say efforts to codify sex are likely to face court challenges, just as other restrictions such as youth medical care have.

鈥淲e鈥檝e already lost this case,鈥 said Idaho Rep. Ilana Rubel, a Democrat who voted against a definition bill approved by the state's Republican-led House, predicting the state would get sued. 鈥淭his is really just an unfortunate gesture that makes people in our community feel unwanted and unloved by their government.鈥

___

DeMillo reported from Little Rock, Arkansas. Contributing to this report were Associated Press journalists Nick Ingram in Leavenworth, Kansas; Hannah Fingerhut in Des Moines, Iowa; Rebecca Boone in Boise, Idaho; Hannah Schoenbaum in Salt Lake City; and James Pollard in Columbia, South Carolina.

The 好色tv Press. All rights reserved.

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