DNA from those arrested for felonies will be collected through a cheek swab and sent to the Colorado Bureau of Investigation for testing and addition to the state database. Those not charged within 90 days can ask that their DNA be removed from the database.
Authorities say the law will solve more crimes and prevent others. A news conference is planned Thursday in Colorado Springs.
The Colorado-ACLU plans to challenge the law, saying it violates the rights of those who should be presumed innocent. Previously, only DNA of those convicted of crimes went into the state database.