Opponents of a proposal defining a fertilized human egg as a person warned Tuesday that it could have unintended consequences, barring doctors from treating women with cancer and banning some birth control.
The proposed ballot issue was introduced by a coalition of anti-abortion activists called Colorado for Equal Rights.
The group has until May 13th to gather the 76,000 signatures needed to get on the November ballot.
Opponents have formed a coalition called Protect Families Protect Choices.
They say the amendment could establish a legal basis for the government to investigate a woman and her doctor for a miscarriage, medical care for high-risk pregnancies that fail or for any action that could unintentionally harm a fetus.
Supporters did not return phone calls seeking comment.