A national child advocacy agency says Colorado is doing a poor job notifying communities about sex offenders.
Stony Brook, New York-based Parents for Megan's Law gave the state the country's most common grade -- an F.
Just two states, Florida and Wisconsin, earned A's.
The states were graded on what details state Internet registries had about registered sex offenders.
They were also assessed on how much information was available to residents and if door-to-door notification was required when a sex offender moves into a neighborhood.
According to the group's report, Colorado requires door-to-door notification for sexually violent predators, but not for other sex offenders.
The state's Internet registry also doesn't include all offenders.