RCW 42.17.550
Independent expenditure disclosure.

A person or entity other than a party organization making an independent expenditure by mailing one thousand or more identical or nearly identical cumulative pieces of political advertising in a single calendar year shall, within two working days after the date of the mailing, file a statement disclosing the number of pieces in the mailing and an example of the mailed political advertising with the election officer of the county or residence for the candidate supported or opposed by the independent campaign expenditure or, in the case of an expenditure made in support of or in opposition to a ballot proposition, the county of residence for the person making the expenditure.

[1993 c 2 § 23 (Initiative Measure No. 134, approved November 3, 1992).]