"Comprehensive Counter-Terrorism Act of 1991"
"Sponsor: Sen Biden, Joseph R., Jr. [DE] (introduced 1/24/1991)"
"Cosponsor: [...] Sen Reid, Harry [NV] - 1/30/1991"
"It is the sense of Congress that providers of electronic communications services and manufacturers of electronic communications service equipment shall ensure that communications systems permit the government to obtain the plain text contents of voice, data, and other communications when appropriately authorized by law."edit: link is not working, but search for the title, it will open up from something like this: http://thomas.loc.gov/cgi-bin/bdquery/z?d102:S266: