Being convicted of a crime is often one of the surest ways for a foreign national to get caught up in the deportation system and possibly removed from the United States. Unless the conviction is not a Crime Involving Moral Turpitude, Aggravated Felony, or other type of deportable offense, there may be little relief for the non-US citizen unless he/she qualifies for some sort of waiver. In these types of situations, immigrants may need to explore whether it is possible to vacate or modify the criminal conviction itself through some sort of post-conviction relief application. Under certain circumstances, overturning or amending the original conviction may significantly change whether someone is deportable or not. For example, many theft aggravated felonies are triggered upon conviction of a theft crime where a sentence of a year or more is imposed. If the sentence is later altered to 364 days, that conviction may no longer be considered an aggravated felony, an important legal determination which can make all the difference.