(CNN) — The US Supreme Court will hear a case Tuesday that will determine whether a Colorado law that prohibits licensed mental health professionals from providing conversion “therapy” to minors is constitutional.

Conversion or reparative therapy promises to “convert” people from being gay, lesbian or bisexual to straight, or to change transgender and nonconforming individuals into people who identify with the sex they were labeled at birth. Research has found that the practice doesn’t work and can even be dangerous: It significantly increases a person’s risk of suicide and can cause other long-term health problems, such as depression, anxiety and high blood pressure. Children who undergo conversion therapy are more than twice as likely to run away.

At least 23 states prohibit licensed p

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