http://uscode.house.gov/download/pls/13C7.txt
SUBCHAPTER II - OTHER PERSONS
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-CITE- 13 USC Sec. 221 01/05/2009
-EXPCITE- TITLE 13 - CENSUS CHAPTER 7 - OFFENSES AND PENALTIES SUBCHAPTER II - OTHER PERSONS
-HEAD- Sec. 221. Refusal or neglect to answer questions; false answers
-STATUTE- (a) Whoever, being over eighteen years of age, refuses or willfully neglects, when requested by the Secretary, or by any other authorized officer or employee of the Department of Commerce or bureau or agency thereof acting under the instructions of the Secretary or authorized officer, to answer, to the best of his knowledge, any of the questions on any schedule submitted to him in connection with any census or survey provided for by subchapters I, II, IV, and V of chapter 5 of this title, applying to himself or to the family to which he belongs or is related, or to the farm or farms of which he or his family is the occupant, shall be fined not more than $100.
(b) Whoever, when answering questions described in subsection (a) of this section, and under the conditions or circumstances described in such subsection, willfully gives any answer that is false, shall be fined not more than $500.
(c) Notwithstanding any other provision of this title, no person shall be compelled to disclose information relative to his religious beliefs or to membership in a religious body.
SUBCHAPTER III - PROCEDURE
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-CITE- 13 USC Sec. 241 01/05/2009
-EXPCITE- TITLE 13 - CENSUS CHAPTER 7 - OFFENSES AND PENALTIES SUBCHAPTER III - PROCEDURE
-HEAD- Sec. 241. Evidence
-STATUTE- When any request for information, made by the Secretary or other authorized officer or employee of the Department of Commerce or bureau or agency thereof, is made by registered or certified mail or telegram, the return receipt therefor or other written receipt thereof shall be prima facie evidence of an official request in any prosecution under such section.
Exactly how many times has this statute been enforced?