The Supreme Court on Monday said it would review a Colorado law that bars mental health professionals from practicing “conversion therapy” for minors, a discredited practice that attempts to change a person’s sexual orientation or gender identity.

Colorado is among roughly half the states that prohibit the practice of trying to change a person’s sexual orientation or gender identity through counseling.

More than 20 states restrict conversion therapy, which health providers say dangerously attempts to change young people’s gender identity or sexual orientation.