Here is a good article I found over on the EFF website.
https://www.eff.org/deeplinks/2013/01/rebooting-computer-crime-law-part-1-no-prison-time-for-violating-terms-of-service
Quote
Here is the CFAA's greatest flaw: the law makes it illegal to access a computer without authorization or in a way that exceeds authorization, but doesn’t clearly explain what that means. This murkiness gives the government tons of leeway to be creative in bringing charges.
https://www.eff.org/deeplinks/2013/01/rebooting-computer-crime-law-part-1-no-prison-time-for-violating-terms-of-service