I knew that this is law in CA (California Code 17538.4,
http://www.leginfo.ca.gov/cgi-bin/waisgate?WAISdocID=28123682+0+0+0&WAISaction=retrieve)
I researched it because I got junk faxes, and that is actually legal as long as they
include a phone #:
<< (1) In the case of a fax, that person or entity establishes a
toll-free telephone number that a recipient of the unsolicited faxed
documents may call to notify the sender not to fax the recipient any
further unsolicited documents.
(2) In the case of e-mail, that person or entity establishes a
toll-free telephone number or valid sender operated return e-mail
address that the recipient of the unsolicited documents may call or
e-mail to notify the sender not to e-mail any further unsolicited
documents.
>>
I vaguely remember reading about a proposed bill like this in Congress, but I wasn't
aware that they passed anything. And a search at http://thomas.loc.gov/ reveals
that these spammers are just lying anyway (what did you expect):
Bill S.1618 is the "Medicare Wellness Act of 1999", introduced by the 106th Congress.
There is nothing at all in there about spam.
-JoeF