You have been fortunate. You may crossed the U.S. border previously when Customs & Border Protection Officers did not perform a search of your history. Sooner or later, Border Officers will do a more thorough check and scan of your passport. When they find your criminal record, you could be barred from entry, arrested on the spot, detained at the border and/or face confiscation of personal property in your possession. Further, if CBP Officers determine that you were fully aware of your inadmissibility and still attempted to cross the border, your denial could be treated more seriously.
Call 866-383-9744 to speak with an A+ Accredited Officer regarding your U.S. Waiver application.