CPB's (US Customs & Boarder Protection) Find an Answer site continues to be bountiful with useful information. The following questions / responses were updated recently: How long is a Waiver of Inadmissibility good for, how do I renew it, and can I use it for both business and pleasure? (updated 6/4/2013) I forgot to turn in my I-94 when I left the U.S., what should I do? (updated 6/6/2013) How can a Canadian citizen apply for a waiver to enter the United States if they have been or are likely to be denied admission either because of their criminal history or because they overstayed a previous visit? (updated 6/4/2013)