In 2007, Encarnacion Bail Romero was arrested during an immigration raid on a Missouri poultry plant. She hasn't seen her son Carlos since.

Carlos is now five and answers to the name Jamison. While his birth mother was in federal custody for immigration violations and awaiting deportation, Melinda and Seth Moser were awarded permanent custody.

The tug-of-war between the five-year-old's birth mother and his adoptive parents is just one example of what happens when the enforcement of immigration law separates children from their parents. According to a recent study, 5100 children of detainees were in foster care in summer 2011.

Seth and Melinda Moser of Carthage, Missouri won temporary custory of Carlos/Jamison in 2007. Melinda Moser says it would be traumatic for the boy to be taken from her and her husband and taken to live in Guatemala.

Carlos/Jamison speaks only English, not Spanish.

Encarnacion Bail Romero was ordered deported back to Guatemala, but has been allowed to stay in the U.S. while she fights for custody of her son. She lives near her son in Missouri but is not allowed to visit him.

Judge David Dally awarded custody of Carlos/Jamison to the Mosers in 2008. Encarnacion was in federal prison 900 miles away and could not attend the hearing. Dally stood by the decision when asked about it by ABC News.

Amelia Reyes Jimenez was arrested on a misdemeanor charge of child neglect in 2008. She was taken to a detention center outside Phoenix, and then deported. She now lives outside Guadalajara, Mexico.

Three of Amelia's four children, including Lisandra (shown here) are U.S. citizens. They were placed in foster care after her arrest. Lisandra was six at the time. She is now 11.

Andrea was eight when Amelia was arrested. She is now 12.

Amelia fought deportation, but eventually was sent back to Mexico. Her parental rights have been terminated. Erica, who was three months old when Amelia was arrested, is still in Arizona. Erica is now almost four.