Your legal rights preclude an AOL-DEA "arrangement (Score 1)

18 USC section 2702(a)(1) states that "a person or entity providing an electronic communication service to the public shall not knowingly divulge to any person or entity the contents of a communication while in electronic storage by that service." The practical effect of this is that you have a private right to sue should your ISP decide to refer everyone using suspicious language in internet communication to the DEA. Additionally, you have protection from unreasonable search and seizure in cyberspace via 18 USC section 2703, which spells out the requirements for governmental access via warrants, etc.