Relevant laws and rules

RCW 80.36.400 - the law that forbids ADADs
RCW 80.36.540 - the law that forbids junk faxes
RCW 19.190 - the law that forbids much spam
47 USC Sec 227 - the federal statute on ADADs and junk faxes
47 CFR 64.1200 [backup] [PDF] [PDF backup] - the federal rules on telemarketing and faxing ("do not call" list violations are here)
Report and order implementing the federal law - some useful info
Memorandum and opinion on the federal law
Analysis of 47 USC Sec 227 - The fourth circuit says to file in small claims