If you need to apply for an I-194 (advance permission to enter the United States) after being denied entry at the US border, the following are the most recent steps.
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1. Find your local fingerprint office (call to see if you need an appointment). Bring your passport, photo identification that shows your address (driver's licence for example) and approxiametly $25 CDN (most places seem to accept debit / credit cards). Cost is between $25 and approxiametly $60 depending on whether the facility forwards your information electrically to the RCMP (if this is the case, skip step 2).
2. Mail the C-216C form to the RCMP. Include a check for processing (approxiametly $25 CDN but call to confirm).
3. Wait up to 1-3 months for a reply... When you receive your completed C-216C from the RCMP ensure it includes the fingerprint chart with a date stamp and the documentation related to your conviction and disposition.
4. Complete a personal statement regarding your intended activities in the US.
5. If you are inadmissible because of a criminal conviction you must also complete a statement explaining the circumstances of each arrest, conviction and the sentence or fine imposed. Additionally you should submit any evidence or explanation of your reform or rehabilitation such as counseling, current employment, marital status, community service, etc. Don't forget to sign and date your statements!
6. Complete the I-192 application form (http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=68db2c1a6855d010VgnVCM10000048f3d6a1RCRD&vgnextchannel=db029c7755cb9010VgnVCM10000045f3d6a1RCRD).
7. Fill out form G-325A (http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=d7c84154d7b3d010VgnVCM10000048f3d6a1RCRD&vgnextchannel=db029c7755cb9010VgnVCM10000045f3d6a1RCRD). Make 4 copies of this document.
8. Get 2 passport photos taken. Some processing centres are now longer taking these photos onsite.
9. Call the US Border Protection office to see if you need an appointment (http://uswaiver.blogspot.ca/2006/01/its-been-over-2-months-now-since-i-was.html). Note: Ottawa and Toronto are now processing on Saturdays only.
10. Show up at the customs border protection office for your interview (bring $585 CDN. Some centres now accept Visa, MasterCard and American Express). Don't forget to bring all of your documents!