Colorado says it won't enforce an abortion reversal ban.
The law allows patients to sue doctors who perform abortions without informing them of the possibility of "reversing" it.
Supporters of the ban argue that patients have the right to change their minds.
Critics say there is no scientific evidence that such a reversal is possible.
Colorado joins a list of states that have enacted or attempted to enact similar laws.
The American College of Obstetricians and Gynecologists and other medical organizations have stated that "abortion reversal" treatments are not based on sound scientific evidence.
Planned Parenthood and the American Civil Liberties Union have filed lawsuits challenging similar laws in other states.
The issue of abortion remains a controversial and politically charged topic in the United States.