INDIANAPOLIS (AP) — Indianapolis high school senior Caston Peters had used they and them or he and him pronouns at school for three years without a problem, but they came home a few days into this school year and told their mother that the situation had changed.

Peters, 18 and nonbinary, heard from a teacher that a new state law meant they wouldn't be able to use those pronouns, or the first name they've used for years, without explicit permission from a parent because the pronouns and name don't correspond with their sex assigned at birth.

This was news to Caston's mother, Kim Michaelis-Peters, who immediately sent teachers, a counsellor and the principal an email asking them to comply with Caston's wishes, and the school staff did. But even though her own child's wishes are being respected, Michaelis-Peters said she has deep concerns about what Indiana's law could mean for students whose parents might not be understanding if they learn from school officials that their child is transgender or nonbinary.

"It makes me feel like there's going to be a child out there who's not going to feel safe at home to tell their parents and the school's going to rat them out for wanting to be called a different name or different pronouns," she said.

Indiana is among at least 10 states that have enacted laws prohibiting or restricting students from using pronouns or names that don't match their sex assigned at birth, a restriction that opponents say further marginalises transgender and nonbinary students. Most of the laws were enacted this year and are part of a historic wave of new restrictions on transgender youth approved by Republican states.

The measures are creating fear for transgender students and sowing confusion for teachers on how to comply but still offer a welcoming environment for everyone in their classes.

"The things that are passing are so vague and so hard to understand that (teachers) don't know what to do," said Cheryl Greene, senior director of the Welcoming Schools Program for the Human Rights Campaign Foundation, which advocates for LGBTQ+ rights. "It just creates this ambiguity and fear with educators because it's not clear."

Supporters of the laws have argued that parents should have a say if children are using pronouns or names different than those assigned at birth. Republican lawmakers describe it as a parental rights issue alongside efforts to restrict how gender identity is addressed in the classroom or in library materials.

"School districts can't shut a parent out of their child's decision about their gender identity because the child objects or because the school believes the parent isn't supportive enough of an immediate gender transition," according to a brief signed by nearly two dozen Republican attorneys general and filed in a lawsuit stemming from a California school district's policy.

Mental health experts and advocates say that requiring parental consent or notification of pronouns forcibly outs trans students, who already face a high risk of bullying and abuse.

Similar restrictions have sparked some opposition in Virginia, where Republican Governor Glenn Youngkin unveiled new model policies over the summer that include a requirement that minors must be referred to by the names and pronouns in their official records unless a parent approves something else. Some school boards have begun to adopt policies consistent with Youngkin's guidelines while others have balked.

Some teachers in other states are finding ways around the requirements or defying the restrictions, saying they don't want to put their students at risk. Since the laws are being enacted in states where teachers have little job protection, few are willing to talk on the record.

Teachers' groups say educators have been given little to no guidance on how to comply with the new restrictions, including basic steps like how to get permission from parents of students who use pronouns or names not listed on their birth certificates.

Indiana, like other states, leaves the specifics up to school districts.