There are a number of facts that can lead to a person being deported. Technically speaking, any person who is discovered to be within the United States unlawfully (that is, without any legal authority) can be deported. As a practical matter, though, it is a near-impossible task for the United States to discover and deport every individual who is not lawfully present in the United States. The government instead tends to focus its deportation efforts on those individuals who are unlawfully present in the United States and who (1) commit serious and/or violent crimes while in the U.S. like homicide offenses, aggravated drug offenses, and/or gang-related crimes; or (2) have been previously involuntarily deported from the United States.