The American Civil Liberties Union is investigating to see if South Dakota violated the First Amendment when it blocked all email sent from a specific Internet service provider. Earlier this month, the state government blocked email sent from ISP Technology Dimensions. A customer of the service was spamming government employees about a controversy involving sacred Native American sites; the governor's office said the petitions were inaccurate. But blocking email access to state employees may violate the Constitution, according to the ACLU.